man2004

iTrader: (1)

The swap is scheduled. The rebuild LS7 with forged internals (non-dished pistons), Katech torquer LS7 cam, and LS7 heads is going into the 98 TA convertible. I am using the stock LS7 intake with a NW92mm TB. My goal is a NA street/strip car with around 500 RWHP and 475 RWT. I am focusing on low end torque since the car will likely never see the drag strip. I am planning to purchase Kooks LT's - the car already has an off road Y-pipe and Magnaflow cat back. I have read that the "standard" round LS1/LS3/LS6 headers will perform about as well as the more expensive "D" shaped LS7 headers. So, I planned to order standard 1 and 7/8" Kooks headers. Does anyone have input on this issue? Also, is there an advantage to using stepped 1 and 3/4 to 1 and 7/8 or stepped 1 and 7/8 to 2" headers for my application?

man2004

iTrader: (1)

Any input???

sssalah

Doubt there will be loss going to round headers instead of D-shaped, but if I were you I'd go with 2" headers. I'm running 1 7/8" on a 6.0 with stock LS7 cam, you should go bigger.

bww3588

iTrader: (49)

honestly doubt it. if you look at it, the LS6 and all rectangle port heads have D-shaped exhaust ports and this is the first thread I have seen asking about D-shaped headers.

ramairws6

iTrader: (33)

I'm running the LS1 flanged Kooks on my LS7 445 and i doubt that it is hurting me anything. If i were you i would at least go to the stepped 1 7/8 to 2 inch. You won't loose anything and down the road you'll have them if you ever add some more go fast goodies!

MikeFSKSpeed

iTrader: (37)

If you haven't ordered the headers yet PM me with what you need, maybe I can save you a few bucks

ChucksZ06

iTrader: (9)

I have the kooks 1 7/8 on my z06, ls7 427. It puts 600 to the wheels with those headers. The exhaust system behind the headers is the most important part on a street car.