(1987 RX-7 GXL N/A)
Hey guys, looking to get some new headers and intake manifold, throttle body, new spark plugs, Autometer (i have my stock tach)

Basically tuning then performance. I am swapping the fluids and such.

but heres my question. I currently got 2.25" down piping cat has been removed. If i throw on new headers and intake manifold. Do I need to get a larger diamter down pipe? And any mods req'd to throw in say a Big Throttle Throttle Body?


On top of that (i know big post sorry)

Any brands you guys suggest for all that i mentioned? I got a 87' rx-7 gxl N/A.

Please tell me what you think! Thanks!