i was wondering if i can put on my stock y pipe on my nismo exhaust. I'm running test pipes as well. Any drawbacks? Huge loss of power? nasty sounds? Anyone have experience? Reason is that i want to sell my nismo y pipe for the time being and get something else down the road.

 

Stock Y pipe would be more restrictive than the NISMO so you are looking at a HP loss of 3-5 which is negligible... You will quiet it down a bit as well. Probably lose some of it's throatiness..

 

hmm, 3-5hp , i mine as well throw the whole stock exhaust back on..lol. since the nismo gives 3-5 hp all together.

 

3 -5 hahaha

Probably nothing bad man.

 

does the stock midpipe even fit the nismo exhaust? thought the nismo ypipe goes to a 3" outlet to the midpipe, and the stock ypipe is smaller than that....

 

It fits.

 

Put the stock Y-pipe back on when my Nismo Y-pipe developed a leak at the flex section. Fit is not an issue. Did not notice a change in sound or performance.

BTW, I think the flex sections on the Nismo Y-pipe are in a bad location, especially when installing with test pipes or HFC's. With my HFC's, the stock Y-pipe, and the mid-pipe back Nismo system there seems to be less visible vibration of the exhaust under the car.

ncdoc