[grocerygetter]

I need to see proof of gains from long tubes.
I want to see a car supercharged then only headers added and tune tweaked. No pulley swaps allowed. No other mods allowed. Dyno or time slip is fine.
This can be ls3 l99 or lsa.
I've seen proof locally of maybe no gain to 10 to 15 whp tops. That's a hard pill to swallow for 1k. I could do some Jba test pipes and rock that cheap.