Does anyone sell a good aftermarket plenum that will fit a 92 z28 with a 5.7 TPI? I've seen the hi-flow runners and intakes but not a plenum.

 

SuperRam?

 

holley stealth ram..thats what i want, you don't need to buy intake runners with them. it adds like 70hp i think

 

Somewhere in these pages theres a link to a page showing you how to port the plenum yourself. Otherwise check out lingenfelter.com. Also thought TPIS did an exchange ported plenum for your stock one.

 

you can't do to much porting the stock plenium, but it will help. I know SLP makes good runners, but if your going to spend the money on them, you might as well just buy a stealth ram instead, its a whole new intake for like $500