Ok, after I am done with the interior and 6spd install, my goal will be to wake up the tired L98 under my hood.

Im wanting to stay with the TPI set up, Im pretty sure ill be getting the AFR heads with a nice cam (Hot cam or bigger). But for the intake side of the house I know nothing of what is availible for my car. I did some research and found the TPIS Big Mouth Tpi Base Intake Manifold and Large Tube Runners. Does anyone know how much of an improvement over stock this TPIS set up is? Is there a set up identical to this that would net me larger hp gains? Pretty much im wanting to keep the Plenum and TPI appearance so the best set up for that is what im looking for. Thanks

 

I was looking at a BM intake and AS&M LTRs.

My research shows on a stock 5.7 with cat back it got a whopping 22hp gain from the runners and 18hp from the intake. Not sure what the combined would be but probably close to 40hp.

With AFRs and the right cam it would just make the combination work better.