my88IrocZ

I am getting a X-Pipe made for my 88' Iroc-Z 350 TPI, it is mostly stock except for hooker Super Comp LT, ported plenium,larger runners, AFPR, Advanced timing,2600 stall,and K&N. So my question is should I go for the 2.5" set up or the 3" set up for the X-Pipe? Thanks for the help.


Dan.

Momar

probably 2.5, but that also depends on what else you are going to do to the car and how long it will be till you do it.

Squeeks83

well if you want ground clearance go with 2.5 but if you want badass ness go with 3inch it will slightly flow better and plus just saying that you have true 3 inch duals on one of these cars is sweet, i now can say this, go check out my thread on my 3inch duals.

Momar

Yes but he has a fairly stock motor and the 2.5s are more matched to his setup. I think dual 2.5s are good for over 400 hp.

Ben

1QWIKZ

I would say for what you have that the 2.5" would be sufficient plus wih the addition of an X-Pipe you will be very surprised at what it can flow.....

five7kid

iTrader: (14)

Chevy High Performance Magazine, latest "My Generation Camaro" article, they dyno'd (actual dyno test, no bench racing) their newly-built (carb'd) 350 with Edelbrock TES, single 3" cat-type y-pipe and single 3" muffler, at 380 HP.

If you "need" a 3" X-pipe on a "mostly stock" 350 TPI, you also "need" some help.

Sorry, guys, what most think is "needed" exhaust-wise just doesn't stand up to reality. Those SC LT's are one example, I'm afraid. Huge sacrifice of ground clearance and dollars for what is most likely zero benefit.

my88IrocZ

I am not worried about ground clearence issues like everyone else is, It is how careful you are and where you drive. I was told the lowest part of running duals would be the collecters. I am going to be running bullets so I am not worried at all about the clearence. Thanks for the input guys.


Dan

Squeeks83

well ill go take some pictures of my ground clearance, i dont have much with 3in and its not the collectores... its the piping over the tranny K-member.

Squeeks83

1

Squeeks83

2

Squeeks83

3

Squeeks83

4

Squeeks83

5

Squeeks83

6

1QWIKZ

I was wondering if you have had any problems goin under the rear just curious..........

Momar

True dual 3" is cool if you need it, but honestly its not probably doing you that much good since your pipes arent even mandrel bent. I bet those bends take it down to about the effeciency of about a 2.5 setup plus you have more pipe to absorb the heat an let the exhaust pulse cool which slows the exhuast. I just did 2.5 inch duals with a h pipe on my car. I have the hooker long tubes. I was able to use hedman s extensions/reducers to move the piping in toward the tranny tunnel. My collectors I believe are as low as any other part of my exhaust if not lower so I should have decent clearance. It is possible to do if you try with 2.5 anyway. I just dont think that setup would have been worth it being as I would not be able to get out of my driveway and my car would be stuck in it forever. lol. Have you thought though that if you do catch the pipes on something and rip them off it is not only the pipes you are risking but you may total your headers also. I would have at least used a section of ovalized pipe under the subframe/tranny crossmember to keep some clearance.


Ben

Squeeks83

the rear and... plenty of clearance, and im sorry that you choose to take apart what i did, momar, im happy with the way it flows, it didnt need to me mandel bended because of the slight bends, and im having no problems with it excapt the cops. im happy, tahts all that matters. thanks though.

Momar

I'm sorry, I didnt mean to bad mouth your exhaust. I think its pretty cool but I just couldnt see driving somthing that low around here. Maybe the roads are better where you are. I was more just trying to give a warning to anyone who didnt have the motor that needed that and just wanted to do it to be cool, because I have seen several times when people have had duals that hung real low that the soon regretted going with duals. What kind of motor do you have ahead of that anyway.

Ben

deadbird

It rare I give an opinion on something but squeeks, that is hideously low ground clearance (I wouldn't be able to get up my driveway with that) and it looks awful from the rear. Our cars aren't symmetric (sp?) in the back and your setup amplifies that severely.

Momar

I do have to say however, deadbird, you have probably my favorite dual exhaust setup I have seen on here. Like I said I couldnt do a exhaust like squeeks because if I did my car couldnt get out of the driveway either(it would be stuck there for good hehe).

Squeeks, I agree that you should try to have the mufflers realigned somehow. I dont know if you will be able to make it look any better from the back though because of the lack of symetrickness (not spelling but a word modified to my liking). If it were possible you would have to probably turn them flat and move them both to the passenger side to do it.

Ben

deadbird

Thank you momar, I appreciate that.
One of my favorites (aside from mine since I made it) has to be *******. The only drawback to his setup is price but, on his car & his setup, it's justifiable (close enuogh on the sp. ).
You can't turn oval mufflers flat where they are on squeeks car because there is only about 7½" of width to put a muffler in that position. That's why I ended up making mine (that and I'm way to cheap to buy dynomax bullets for the price they ask).
I have to say the one thing I don't like about my exhaust is it's not as quiet as I wanted it to be when you're getting down & dirty. I guess that's a 'cake & ice cream' thing though. It is bassy 'stock' quiet at idle though. I may end up making a new 'crossflow' muffler that fits the stock location but is dual inside (I'm sure someone really cares aside from me )
I found out my cousin has a digital vid cam so maybe in the near future, I might get some vid/sound of my exhaust up. Don't hold your breath though

CrashedMatrix

You need to check out my exhaust setup at http://www.91firebird.0catch.com/ my muffler has a built in x pipe and i have good ground clearence with dual 2.5

Squeeks83

sorry then momar i thought you were taking a shot at me,

i have a built 355, all the good things, i have domed pistons, firged 5.7 rods, a billet crang, stock heads but ported/polished w/ 1.94 valves, edelbrock performer intake and 600cfm carb. soo im putting on some new heads thats the only thing i can really do for naturly asperated engine. any ways the roads aroun here are decent.

Deadbird, i know, the guy that did it did the best HE could, so im having a friend take off the mounts on the back and reallign them, i nitoced that but for now i dont really care because my car ISNT a show car. its just for fun.

jamesbern

Honestly dual 2 1/4" will work fine for most any streetable 350 ( under 500 horse). Even on my 383 2 1/4 duals had quite a bit more low end torque than dual 2 1/2's. Dual 3" pipe on any smallblock will cost you power, yes is sounds cool, but you will lose most of your bottom end. I have had most combos on my car, stock, single 3", dual 2 1/4, and dual 2 1/2 and dual 2 1/4 worked best and it was easy to build and very quiet.

CrashedMatrix

this is what im talking about

Momar

Did any of your exhaust setups have an h or x pipe, because that will help out with the lowend also.

Ben

CrashedMatrix

my muffler has a x pipe built in its hard to see but ill post the pic.

Momar

Yes, I saw that on your site, but I was kind of curious about jamesbern

jamesbern

Yes, they all had an h-pipe, but like I said the 2.5 duals took a noticable amount of my low end torque away. I was really wanting to lose some of the bottom end for traction purposes and thats why I went to the 2.5's.