Ahhhh what a nightmare working around that crossmember! I really want to design something different that tucks up much higher but don't have the materials or time at the moment. Anyways, I made a run over to Summit Racing on the weekend and picked up parts for my new dual 3 inch exhaust plus a purge valve kit



Well, I got started on things Monday laying under the car for a good hour just looking. Cut the first U-bend in half so it was easier to handle and started thinking of how the heck this was all going to work. Well so far this is what I've come up with.



3 inches of ground clearance at the lowest point so far This is the main reason I want to make my own crossmember. Hopefully a redesign will allow me to tuck it up more if I run it beside the trans.



The crossmember was the lowest point on the car (5 inches) before all this exhaust work started to be done including the hooker 2210's. Can't wait to hear this thing fire up after it's all finished. These bullet mufflers aren't going to be doing much "muffling" hehe.


I'll probably end up changing everything later on just to get some ground clearance back. Right now I just want to drive my dang car. Haven't driven it for a month and a half since it's had no exhaust. Finally got some time to finish it up.

 

WOW! I am your biggest fan right now. I need to do the same exact thing. Spohn x-member, and 2210's. I def need to keep the pipe 3" with the cam I have. I would love to see what you do and how well it fits. I can fab to but am not super good at it. If you finish soon please list what parts you got (pipes). Thanks a ton.

-Dennis

 

Good luck EvilCartman, it´ll be good to see your system once it´s finished.

Currently I´m running 2.5inch true duals with the Spohn XM SFC´s and Alston SFC´s. I´ll get round to making a post about it soon.

 

I've entertained the idea of modifying the crossmember, but I don't think I'll bother. I'll be doing something similar with a set of Hedmans and 2 1/2" pipe in a few weeks.

 

Looks like this is the way to go . I am sad cuz I am tired of making parts. But oh well. I was looking forward to just spending an arm and a leg for a ready made set up. 1000 bucks is a bit steep. (ebay pipes) + I don't trust them with the set up I have. Too many things unaccounted for.

Dual 3" sounds right for a 500 HP SBC right? It is not overkill or anything right. My motor is a high rev'er so it is going to want a lot of flow.

Oh and one last thing, does anyone know how those summit bullets sound. Rasspy or anything like that. I am going to need a good amount of muffle due to my big cam and it is a street car. I have a summit in front of my, but can't find anything that looks like it will take up sucj little room. Thanks guys.,

 

So far the parts list is this...
4 summit brand mandrel u-bends 3" x 4.5" radius
2 summit brand 3" x 4' exhaust tubing
1 hooker 3" to 3" reducers (they sell in pairs)
2 Dynomax Ultraflow bullet mufflers

I'm gonna try and finish it up this week, probably get the driver side done tonight and start on the passenger side. I wont be running an x-pipe or h-pipe, just doesn't look like I'll be able to do either. May have to dimple the top of the tube under the subframe for when the engine torques over, I've got it pretty close to there. Might post a couple more pics up later tonight.

Dennis, the dual 3 inch on a buddy's car is working awesome and he's running about 470 hp with a 125 shot on top of that. It really woke up the engine going from a dual 2.5 to the dual 3.

 

Feww..... Ok thanks for the input ^^^^^. I was thinkin' for a bit that I might be going overboard. But that is just about what I am going to be running. maybe a little more or less N20.

I think I am going to copy your idea and maybe get a little oval or frame clearance pipe sections if I think it is going to help. I wish I knew how low the car would be. No engine or tranny makes it stay pretty migh up there. haha. Oh well, all in good time

 

I'm planning on going over the axle in the rear, so I'll be able to include an H pipe.

 

where?

 

Behind the crossmember.

 

try some oval tubing and transitions from spintech for more ground clearance.

 

Too late for me hehe finished the driver's side, starting on the passenger side in a few min. Might do an oval system for the next one though, or just get a steam roller to run over what I have

 

I am thinkin' about oval set up too. But it is just soooooooooooooooooo much more $. I am not going to buy any pipes til I drop the motor and tranny and get a better idea.

Maybe just some parts oval.

 

No new pictures just yet but it's 90 percent complete I started it up a bit ago and wow it's loud. Still need to weld on some turn downs, hangers and maybe tweak a couple things here and there but it sounds mean.

 

Is the motor in your sig what is running behind it?

Since you have allready gone through most of what I want to do, how would you make it quiet down if that was what you, for example, wanted to do? I think I can fab it up, but I really want to have it quiet down. I come home too late at night to have it be screaming all the way home. Spintechs? I think I might be going all oval anyways.... Something like that.

 

Dennis, the problem with oval is that everything oval is expensive. Especially oval bends. If you do some parts oval, then you'll have to buy some oval to round transitions and those are pretty pricey, too.

 

I don't mind spending $

 

I just checked Dr. Gas and I guess they're not quite as expensive as I was thinking, about $40 each (oval to round transitions).

 

Dr Gas has the "frame clearance tubes", but I don't know how much use they'd be anyway in this case. They won't do much good for the compound angles needed to clear the frame rails in front of the crossmember. For going under the stock crossmember they'd be great, but the Spohn crossmember is so much lower than that.

 

Another option is too buy smaller diameter pipe, then cut it in half and add some flat metal. Once welded up you have oval pipe. A friend used 2" and added 5" to the middle. It's alot of work but can be done. This was on a 7 second 10.5 tire car that is LOW.

On my car i used a press and two pieces of steel to oval my round pipe. I have dual 3.5" under a spohn crossmember. My car is lowered a little and still has adequate clearance.

 

I second radialtirekings idea. I ran a pro streeted bbc acadian (chevy II in the states) and I ran a cut and welded 3 1/2 system w/ single chamber race flowmasters and brought the tails out in front of the rear wheels by using 2 1/2 split down the middle and 4 inch flat stock welded in the center. Sent the tails out for chroming after they were done. Very effective and looks killer when you angle cut it! Very time consuming though.

 

Yep, the motor in the sig is what the exhaust is connected to. Humm quiet it down, probably run the pipes over the axle and get some different mufflers or go with some Spintechs. Just got back from driving the car and wow, both windows down and holding the go pedal down made my ears tingle It almost sounds like when I ran an open y-pipe at the track. Normal driving it's not too bad but when you step on it, look out. Past one test so far, drove straight over a speedbump and it doesn't hit, so long as you're going slow.

 

Nice, I am not too worried about speed bumps here thank ***, I acctually havent seen one in quite some time, But if you clear one of those then you must have more than enoguh clearance.

I decided I am going to run 3.5" oval or maybe 3" oval in the tunnel and then have then hug the floor pan and have 2 cruiser mufflers. Only 2 1/4" thick. then dumps, I don't really like side exits anymore on our cars. I used to

 

Here's a short clip of how things are sounding. Did it kinda late at night so no big revs and didn't allow the engine to warm up hence the very low idle. I placed the camera back about 15 - 20 feet behind the car so the sound wouldn't distort.

 

Nice and throaty when the throttle is blipped

 

YOur neighbours must luuuuuuvvvvvv you!

 

Don't really have any close neighbors which is nice, they're about a block away. The only close one has a Nova that's pretty loud itself

 

sounds just like my car with open y pipe lol. is that an lt1 starter i hear?

 

The starter is a Napa brand gear reduction starter. Looks pretty much the same as the ones at Summit Racing. Made another sound clip but it came out distorted when reving to 5 grand I'll see if I can get some actual video of how it sounds on the street sometime or I'll just wait till going to the drag strip later this month.

 

Sounds great. Real mean. Hope mine sounds sorta like that but a little quieter. You think oval will be louder in any way..... Also do you think that the cruiser series mufflers from spintech will be even louder? or quieter? My entire exhaust will be 2 1/4" by 3.5" oval. What do you guys think.



By they way I can't wait to hear the new sounds clips.

 

Out of curiosity, I contacted Dr. Gas about the dimensions of their frame clearance tubes. They tell me that they can make nearly anything to spec, so it might actually be possible to get something to clear the Spohn crossmember.

 

I plan to build my entire exhust through parts bought from them.


You can get oval as thin as two and a quarter inches thick with matching mufflers that are the same thickness. You can run pipes that thin wherever you want and not scrape them. I am still going to tuck them as much as possible. Now I just havet o secide where to put the damn mufflers. I think right neer the rear tires, just in front. No idea what is going to happen with the spohn memeber. I am going to try some crazy idea I have never seen yet.....I will show you guys if it works.....gonna be soooooooooooooooooo much work hehe....

 

I'd be happy if they could get it down to 2", or maybe even 1 3/4" or 1 1/2".

 

They can

 

Of course by the time it's that thin it'll probably be 10" wide or something. :P

 

I'm betting they'll be a lot more quiet but not too quiet. My setup seriously sounds like a stock motor with open headers when you get on it lol.

 

right. Thats what I thought it might be like. I wanna make it flow a lot, but also be as quiet as possible.

 

Let me see if I can make a soundclip of a cruiser muffler on my 91Z. I won't be able to do one driving because I'm just going to stick it up in the open ypipe.

 

k

 

Let me know if this works... I've never used this filehosting service before.
http://www.filefactory.com/get/f.php...a62d650a499687
5.4 megabytes
I had a cruiser muffler laying around and just got my headers on the other day. It's only a 2.5" in/out muffler, so I just stuck it in my ypipe with a wet rag around it so it didn't leak. Laughing is forbidden.

 

Thanks for the pic. They really are low profile. I will def pick a couple ovals up. They come juuuust big enough for me in oval I think.

I think I will pick it all up today.

 

bump......any more pics of this dual set up. I am gonna order some oval tomorrow.

 

Haven't had the chance to get my car up on a lift yet for pics. I did however just touch the driver side exhaust on the ground making a hard right turn No sway bars on at the time either so it was like a Caddy.

 

Not bad considering that you didn't have sway bars. I would love to see how you routed. I will be ordering some oval this afternoon I think. I am gonna go oval from the collectors to the mufflers, then round. I also need to raise the car, cuz the sportlines are just too damn low.

Anyone know where to orger some good stiff springs that are normal height?

 

I'll try and sneek my car up on a friend's lift tomorrow but no promises. I'll have my own lift in a couple weeks though Just bought it today but the guys who have it in their shop want to use it for one more project.

 

aswome. I can't wait to see the pics. Must be nice to soon have a lift.

I am keeping myself busy with ignition instalation till I see what you did. Later

-Dennis

 

WOW, this is an awesome thread! Good pics Evil That car sounds great. Cant wait to see the pics from the lift.

 

No lift pics yet, I'll try again tomorrow. Even my friend who owns an exhaust shop wants to see what I did. He also asked why I didn't take the car to him for the new exhaust LOL I don't think there's any hard feelings cause tonight he gave me one of his big block engines used to be a blower motor making 1000 hp but now needs to be gone through. He kept the blower of course and the heads but I got just about everything else. So now I have 2 big blocks in my garage that are mine muahaha now what to do with them.

Dennis, yes the lift is going to be very nice to have. Hell I'm happy to have a place indoors now to work on my car. Ever since owning it, all my work has been done outside in the heat, rain or cold weather. Getting a lift is just icing on the cake

 

I just got those mufflers that you got. They seem like they are not gonna do anything. lol. Also got some 3" pipe and bends. Slowly reaching my goal.

 

I have dual 3" exhaust as well. I just went to a custom shop and had them bend some pipes to work. So far, it only scrapes on the nasty stuff you'd expect it would. When/if I do lower the car in the future, I'll definately have to do something different. I'm sorry I don't have more detailed shots, but I'll post a couple just to maybe add something to the thread. The car is actully in storage right now, so I can't get any newer pics until the spring. With the 383, 2210's, and the Flowmasters it sure does sound nice though.