Clearance for a clutch install is important to consider, I just went past MAC LT's on a new clutch install and it was not fun at all. I would wonder if the more expensive LT's have more clearance for a clutch install....I don't think I could of done it w/o my lift honestly because the trans had to get turned in the air then slid in w/ virtually no clearance...and this was with loosening the entire pass side header.
You had to do this with a mac header? I ran into that issue with BBKs on a 4v. But I can easily get the trans out of my 96 (4v) with mac LT's.
40% increase in area and volume from 2.5" to 3". I was hoping to make a 3" exhaust, hence the want for 3" collectors.
How much power are you planning on making?
I have read many times these motors make better numbers and track times with a smaller exhaust, NA... But supercharged? Anyone know for sure? I don't feel like spending the time and money to find out for myself.
I DEFINATELY would not go larger the 1 5/8s and 2 1/2" on an N/A modular. And it also depends on how much power is being made on a supercharged application.
Around 500 or less, Id still stick with the smaller headers and collectors.
Over that, it would depend on the combo and intention of the car. A daily driven Centri blown car, I'd stick with the smaller exhaust. For a twinscrew car, you can get away with bigger primaries and collectors due to the massive amounts of low end torque.
My 96 Cobra is a prime example of a small exhaust performing well. It consists of mac 1 5/8's LT's, O/R H, and a flowmaster 2ch (american thunder) cat back. I still love the classic H pipe/flowmaster sound.
At may power level (677/643) I know there's more in it swapping to a larger and better exhaust. But it obviously is not hurting me THAT bad to make that kind of power and run a 9.93 @ 142 with a stock longblock 04 Cobra motor and a KB2.8H.
I'm planning on upgrading to a set of American racing 1 7/8" headers, 3" O/R X, and 3" bullets dumped (I know I'm going to hate the sound, but I'm going for max performance) When I do swap to the bigger exhaust, I'm going to make sure to report the true gains. I wont be able to judge the improvement by my track times because I'm about to put the car on a MAJOR diet before the exhaust gets changed. I want to see how quick I can get it without adding anymore power
EDIT: I just saw this:
That's a good deal. Problem is I just totaled my car the other day... I don't need headers, I need a whole new car...
That REALLY sucks. I wish you the best of luck with getting a replacement for it.