Post by
DCaff300ZX »
https://forums.nicoclub.com/dcaff300zx-u136230.html
Thu Nov 05, 2015 9:28 pm
I had 2 1/2" exhaust from exh. manifolds back, hi flow cats and resonators and Magnaflow 2 1/2" inlet (Big Dog? IIRC, was 7 years ago...) single exit mufflers with larger dual tips.
However, pipe diameter size really doesn't mean much unless you're running big HP, as it's about flow modulation...my 400HP+/- TT has stock exhaust to the back except for upgraded DP's for the 530bb turbos, and my "custom" HKS 2 1/2" catback with 3" single exit mufflers with custom SS dual tips. The TT has had some exhaust manifold porting done similar to MSP manifolds to increase flow to the turbos and out, while the better flowing mufflers and tips then reduce back pressure for max spool up and exh. gas exit, so anything more isn't really needed as the stock system flows well enough for 500HP according to my Z guy and I agree as mine sounds awesome and works great while not being TOO much of an attention-getter, but still sounds obviously modified.
Focus on making things as straight as possible and making any bends as round as possible, and open up the back end for the best results. I also had a true dual setup (no crossover/x-pipe) which I felt worked well for my NA and I've seen that others have done as well...just a thought, not any real "better" solution other than that I feel it's best to have separate sides for the exhaust since the whole intake scenario crosses over side to side and is kept separate. I never had any imbalance issues which is the main benefit a crossover system has.
As for the seats and brackets I don't know about that as I've not done more than swap in better seats to the NA. I will say that replacing them with any quality seat that is comfortable for you would be a benefit, as the stockers are very heavy and replacing them is free weight reduction performance.