stock headers vs aftermarket
Thread Starter
Racer
Joined: Nov 2004
Posts: 265
Likes: 0
From: Angleton Tx
stock headers vs aftermarket
I am interested in getting a set of aftermarket headers, although
my 1990 seems to have stock headers. The headers I have been looking at are 1 5/8. Has anyone here modified thier 90 or 91 Vette
with aftermarket headers. If so did you guys have a dyno test run on
before and after. I already have magnaflow mufflers.
I would also like to run true duals but wonder if adding another
catylitic converter will keep it legal. Does anyone here have experience
doing this?
thanks
my 1990 seems to have stock headers. The headers I have been looking at are 1 5/8. Has anyone here modified thier 90 or 91 Vette
with aftermarket headers. If so did you guys have a dyno test run on
before and after. I already have magnaflow mufflers.
I would also like to run true duals but wonder if adding another
catylitic converter will keep it legal. Does anyone here have experience
doing this?
thanks
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Dyno results show roughly 15hp to be gained from adding headers. True duals might be slightly better, but you will need Random Tech's bullitt cats (for example) and it will need to be fabbed up.
It should pass a sniffer test if you replace the original cat with a new one.
See my website for further information.
It should pass a sniffer test if you replace the original cat with a new one.
See my website for further information.
