primuz

Hey guys
how many hp increase if put Apexi N1 muffler ,weaponR adjustable fuel regulator pressure , K&N intake and Apexi V-AFC on my Jdm Si Vtec??

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KB798

hm...i'd say around 15 total...20 max.

Crate

n1 muffler? or full catback exhuast? Just the muffler, not much if anything. I'd say 10-15ish. (Main thing would be the vafc.) And get it tuned after you raise the PSI on your fuel pressure.

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jdm h22 - 180.3whp 151.4lbs/ft

primuz

full catback exhuast includes the 4-2-1 manifold
right??

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ludeact

full cat back means new larger piping from the cat conveter back including the exhaust canister. the 4-2-1 manifold is the header. I would say that since you're not that heavily modded i would not get the FPR, but it does look cool. And you should get the basic bolt ons before the VAFC. Just my 2cents tho. I would do = AEM cold air intake, Greddy SS header, and Greddy PE or SP exhaust. This would give you ~8-10 hp, and your car will say ahhhhhh!

ludeimg

the cat back goes from your cat through your muffler. the manifold or header is a completely different story. you need to buy a diff. one. dc sports makes them as well as apexi. im sure other companies have them but i would go with one of those two. you cant really speculate hp cause there are way too many variables in that. like the shape of the motor, tuning, quality of product, or even the dyno that you put it on. but yeah you should definetly get 10-20 ponies out of that. it would defenitly be a good idea to get all that stuff cause it WILL help and you WILL feel the difference.