MikeD.

iTrader: (1)

Currently have a set of TSP 1 3/4 long tubes on my 10psi Procharged lq9 with a torquer v2 cam, 3600 stall, 4.10's etc. Long story short, one of my headers needs replacing, and I am considering going with Speed Engineering 1 7/8 vs the 1 3/4 I have now. The rest of the exhaust consists of single 3", 14" magnaflow and exits at the bumper. Would the 1 7/8 be of any benefit vs the 1 3/4?

03sierraslt

iTrader: (22)

Your single 3" is hurting you more then the primaries. Yes 1 7/8 is better but keep that 3" on your radar for some updating.

ZO6Ted

I am of the opinion that even a boosted 5.3 will benefit from 1 7/8" unless its very low boost like 6 lbs. or so. It seems there is not much downside from the larger header either. Wont be a whole ton of difference but it will help a few ponies. Definitely worth it.

MikeD.

iTrader: (1)

So as far as the exhaust is concerned, what would be a better option for diameter? 4" or 3.5"? Also, since they go from dual 3 to a single 3" y, assuming say I went to 4" after the y, will that 3" merge be an issue as well?

03sierraslt

iTrader: (22)

Dual 3 or do a dual 3" into 4" merge with a 4" tail.

2002_Z28_Six_Speed

iTrader: (20)

I'd go single exhaust if I was going to do it all over again. Simpler, cost less, Use existing mounting points. Not as loud too. Dual 3" is overkill and will do 680 ponies.

Blown06

iTrader: (32)

Here is the deal when talking about exhaust set ups for blower combinations:

It can't be too big......period

Vortec350ss

iTrader: (20)

I agree with travis to a certain extent.

Your combo will like both the larger primaries and tail pipe.

However, a properly sized exhaust and well designed camshaft can take advantage of exhaust scavenging much better than something thats too large.

MikeD.

iTrader: (1)

Taking this back up, I will be getting the exhaust done next week. So how should I go about this? Do I go dual 3" or single 4" with a new y that is actually 4" merge? Truck is 4/7, and even my single 3 over the axel has a ding in it from my axel housing hitting, so keep that in mind. Although I do recall the exhaust shop saying that can ovalize it to go over the axel

2002_Z28_Six_Speed

iTrader: (20)

If your builder is decent they can overcome the over the axle issue. I build my own dual 3" exhaust in my garage. Over the axle in SUV platform and no bangs to this date. I used my Magnaflow kit as a model and modified from there. Plenty of room for 3" duals my friend. No worries!

BTW I believe Spintech sells oval parts to all you home gamers out there.