How much hp increase would I expect if I were to install a good exhaust system and what exhaust brand would you guys suggest to buy? I have a 2002 maxima SE.

 

I don't think there are any exhaust aftermarket parts for the 2002 yet...

 

Until there is a Y-pipe all you can do is a high flow cat and cat back system. (unless you go completly custom)

You are looking at about 3-5 hp at most.

I'm not sure if Greddy has a cat back that fits the 2002 yet?
For the cat you can get random technologies, but there are other brands that are cheaper.

 

how much hp does the 2001 maxima increase by having an exhaust?

 

not really sure but...between 10-15hp at crank, and 5-7hp at wheels

 

varies based on other mods like an intake but here are rough figures,

headers 1-3 hp (above results of y)
y-pipe 10-15 hp
free flow cat 1-3 hp
b pipe 1-2 hp
muffler 1-2 hp
cat back (bpipe and muffler) 1-3 hp

Other than the y pipe, your not going to get real gains from the exhaust.

 

thanx max!!!! this information was very useful to me... u da man