atm I have a stillen y pipe, full 2.5" piping w/ resonator, and a greddy evo2 muffler. since I am running the 2.62 pulley I notice that there is a LOT of extra backpressure. Im thinking about running a 4" exhaust system the headers back. any input on this idea?

 

I would vote, NO. 4" is overkill and just pointless.

I think your best bet is to get a Warpspeed 3" y-pipe with test pipe, and make a nice 3" mandral bent system, from the test pipe back to a quality muffler. You wont be dissapointed in the power and sound.

-matt

 

as long as it will be enough =)

 

Most BBC drag cars don't even run 4" exhaust.

 

Unless you have 700whp... nope. 3-inch is enough for ANY boosted maxima.

 

The ONLY vehicles I have seen 4inch exhausts on make 700+ whp OR 900+ wtq (diesel trucks)

 

I know of at least one car that gained power going from 3 to 4in exhaust, but that was a 612whp civic. Like most said way to much for just a supercharged maxima

 

Maybe you'll want to considering signing up for the 3"....

http://forums.maxima.org/showthread.php?t=519304

 

You definitely should get in on this

 

ahh I guess 3" it is. well, trying to buy a y-pipe atm and im going to get a custom mandrel bent 3" system with high flow cat and a blitz muffler

 

How in the world did you "notice" there is alot of backpressure? Did you install a pressure gauge in your exhaust and datalog it or what?

To reiterate what everyone else said, 4" = pointless for you.

 

yes I will probably go with a 3". I will just redo my stillen ypipe to 3" and change all the piping.

 

but chicks dig a guy with a big pipe....

 

To reiterate what everyone else said, 4" = pointless for you.[/QUOTE]

+1

 

even if u were to accomplish a 4" downpipe and after, wat about your headers? dont you think they would restrict the airflow. whatever flows into the y pipe is whatever the headers can let out, no matter if u have 4" or bigger. i say invest in headers if u already havent done so.

 

4" is an overkill. Even 3" is usually an overkill for a lot of FI cars. For some reason, people think they really NEED 3" exhausts. It can't hurt but usually it's not neccessary.