Quick newb question. Does the Nismo Cat back exhaust include a Y-pipe, or does it bolt to the stock one? If it is a new y-pipe, is it as thick of tubing as a fuji or gruppe-s?

 

Yes, it comes with a Y pipe: http://store1.yimg.com/I/ntnsracing_1861_134386647
Should be comparable to fuji and gruppe-s

 

Yup -- includes the Y-pipe...

 

Why then does the entire Nismo system only produce 4 or so whp, when many people are saying they get 5+ just from the Y-pipe?

 

In the Sport Z Magazine Exhaust shootout, the NISMO registered 6.3hp/4.5Tq.

It's hard to compare gains measured or claimed from two totally different sources. If they aren't measured by the same dyno on the same day with similar conditions, you can't really trust the numbers for a comparison. Especially when they are small or the difference is small.

Supposedly, the gains on most of the Cat-back exhausts are from the Y-pipe.

 

Yeah all the gains from a cat-back exhaust are from the Y-pipe. The nismo exhaust makes 6.3hp/4.5tq. just from that y-pipe. The mid pipe and muffler are just for looks.

 

Is the complete Nismo exhaust the same as Fujitsibo's stainless exhaust and y-pipe?

 

for Ypipe design.

Nismo = Gruppe-S = Megan = Fuji (minus the crossover piece)

 

I built my own, the flex pipe on all aftermarket y-pipes hurts performance, mine doesnt have any.

 

slightly off topic, but here's an overlay of the Fujitsibo vs JIC

the Fujitsibo has the connector pipe, the nismo doesn't

without flex joints, you risk cracking your pipes

can the nismo pipe be used with stock exhaust?


BTW I'm going to be selling my nismo Y-pipe soon really cheap. It works fine, but the flex joints are slightly smashed in - not a lot, just barely. It sounds worse in writing than it really is. The pipe is 100% fine otherwise and has no cracks or leaks