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Originally Posted by j_moy_08
So how much power do you think im gonna gain from an intake and exhaust?
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About 10-15hp is the 'general' gain, assuming that the car is in good running condition, and the existing intake and exhaust are in good condition.
If the intake or exhaust are in poor, or restrictive condition, you are losing hps, so new systems will feel like a bigger gain.
ie: when I got my '89 N/A, the exhaust system was restricted starting from the cat back. Someone had done a crappy job on the system.
The pipes went from 2 1/2", ran about 18", then down to 2 1/4", ran back to about 12" from muffler, then down to 2" on into the muffler, and coming out the muffler was 1 7/8".
When I put a new 2 1/2" Magnaflow cat, resonator, pipes, and muffler on....WHAT A DIFFERENCE !!!!!
Headers (OBX) are next. I expect to gain at least 10hp from them.
PS. top speed before new system, 125mph....after, 140mph.
(disclaimer...not recommended for everyone...wear a helmet !!)