As most of you know, I recently sold my 84 Z in favor of a "GASP" fourth-gen that I could not resist.

Anywho it's got the following setup for the exhaust:

JBA headers 1 5/8 primaries, 2.5 inch collectors
SLP stainless Y pipe (either 2 1/4 or 2 1/2 in.)
Gutted stock cat
3 inch adlustable Borla System


Here's the thing, with this setup the car puts out 390 rwhp.
I didn't even know the collectors were 2.5 inch until I changed the gaskets!! I couldn't believe it, didn't make much sense to me at all why the guy didn't go with 3 inch.
I was just curious if anyone thinks it would be worth it for me to swap them out. I'll be getting a supercharger soon and want the least amount of restrictions possible, but the rest of the exhaust is staying the same, I like the sound. Also I don't have the cash to re-do the whole she-bang.

What do you guys think? Are the weenie collectors costing me 10 or more ponies at the crank????

 

No one has any ideas??? For a thirdgen, I guess it would be the equivalent of switching from Edelbrocks to Hookers or something. But with 460 hp.

 

With that much hp, there is going to be a difference, especially with a blower since you will have a lot more exhaust gasses. I would say leave it the way it in until you have the money to replace it all and then do it. You will be losing some power, but it won't be like oyu're losing 50hp or anything like that, maybe more around 20-30 at the very most.

 

I would stick with what you have. I have seen a 95 z28 with the JBA headers and borla catback put down 650 rwhp. jmo

 

Is it an LT1 or LS1. If you are putting 390 at the wheels with those headers you will poo when you put long tubes on. I take it you have had the thing dynoed. Long tubes are the only way to go. 1 3/4" of course. I have seen sets of long tubes yield 26 at the wheels on LS1's. I would look into the Arizona Speed and Marine long tubes or the Hooker. Far superior to the JBA's. You could see 20hp and put you over the pattened 400rwhp fourthgen club. Check out camaroz28.com and see what those guys are running. I am getting AS&M when my wallet allows a massive dump in the LT1. By the way. don't count on this stayin open vary long. non-thirdgen.

 

It's an LT1 block.....converted to LT4. Yes it has been dynoed. I have done a thing or two and it could even be over 400rwhp now, but I'm not getting my hopes up. I was thinkin' about longtubes!!!! Summit racing sells pre made stainless Y pipes for SUper Comps!!!!!!

About the thread being shut down, that would be kinda dumb because header science is header science whether we are talking fourth gen or whatever. There are thirdgens on the board with LT1's and LS1's in them so this post could easily benefit them as well.

Not directing that toward you BTW, just toward the board and moderaters because if it's really technical and involves a GM engine, the thread should stay open.

 

Very true but I was affraid since although this is a GM motor, it is in a fourthgen car. But you should really look into longtubes. I would stay away from that stainless y-pipe that you saw in summit. I hear the fitment is horrible with it. You are better off with a kit that comes with a y-pipe or use the hooker y-pipe with their headers.

 

Hooker long tubes have a y-pipe available for fourth-gens to work with their longtubes????

Or are you talking about supercomp shorties?????

I'd probably only change the headers if they'd get me over that 400rwhp mark, and I know longtubes would.

 

Hooker has an offroad y-pipe now. I would look at the Jet-hot long tubes. they are a perfected design of the hookers with a better flange and slightly better fit. Jet hot is comming out with thier own y-pipe soon but Hooker does make an off road one. And this is for the long tubes, not shorties. Plus they come coated and are a better deal out of the box. The y-pipe is sold separately than the long tubes. The Jegs part number for the off road Hooker y-pipe is 520-16723, however this is for the LS1 version. I do not have the LTx version off hand. The y-pipe is included with the shorties not the longtubes.

 

I checked Thunder Racing and they have the Hookers for $410 bucks. they also have the MUFFLEX y pipe for $250. The Mufflex piece is beautiful. It utilizes a flowmaster 4 inch y collector, and looks alot better than the Hooker y pipe. Hooker does make a y for the LT1 setup and Thunder Racing sells it.

So for about $700 bucks I sould be able to get at least 20rwhp. I can't wait.

 

There ya go man. Watch out for the mufflex 4" pipe. I hear that the mufflex is a rough fit as well. Pretty much all y-pipes for the tru long tunes are a chady fit. The midlength headers for these cars have the really good y-pipes but you pay for it. QTP, FLP, Arizona Speed and Marine and a few others. Plus you have to get a reducer to attach it to your cat-back. No biggy but an extra expense. I would buy striaght from Jet hot. Same header, slightly better, and slightly cheaper. Now all you have to do is worry about ground clearance. In that case you still may want to look at some mid length set-ups, especially if you want a cat, clearnce and performace equal to true longtubes. Plus they have better collector flanges.

 

Cheaper???? What do they run???? You must mean cheaper for the coated version. If you mean cheaper altogether.......WoooHOOOO!!!!!

 

Yea I mean cheaper coated and uncoated. I think you can get the jet-hot long tubes coated, direct from jet hot obviously for 600. The y-pipe is 1XX more though but for 700 and some change you come out with the same thing as the hookers except for a better flange and alittle better fit, plus the great coating. All and all slightly cheaper but with more benifits.

 

You gonna tell me where to find them or what????

 

Hang in there, I thought you knew.
You have to order them direct fom jet-hot. As for pricing you need to call them. They just now posted some of their stuff. You usualy have to call them.

http://www.jet-hot.com./pages/newheaders.html

 

Does anybody else have any ideas on a longtube/y-pipe header combo for my car??? How bout the prices for the Jet Hot setup??? I might have time to call them tomarrow but if anyone knows, plese let me know. I am not exactly rollin' in the dough so the cheaper the better as far as coated and uncoated.

You guys think this will put me over the 400rwhp mark for sure???

After the Sfc's and the Torque arm, with 400hp at the wheels, you guys think I can run 11's pretty easily on 275/40's????

 

You should be over the 400hp mark for sure. You may need another tune to get the last one or two ponies out of her but you should get there. The hands down best headers for any LT1/LS1 fourthgen f-car are the Hooker longtubes, FLP long tubes, or the Arizona Speed and Marine. You may even want to look at QTP (Quick Time Performace). They all have 1 3/4" primaries, 3" collectors and are either a long tube or a mid length. Stock LS1's pick up 26rwhp with Hooker longtubes on a stock motor. As for 11's with that tire. You are going to be very traction limited. I am glad you mentioned torque arm. You are really going to need it with that amount of power, subframes and lower control arms are a must along with some relocation brackets. You may want to look into getting some drag radials and then I think you will be in the 11's all day. Most 400rwhp LT1's and LS1's that have traction are in the lowe to high 11's. Guy here in town has 410rwhp in his 99TA and he ran a best of 11.01 the other week.