dimebag

ok, so i no these 5.0s need a little backpreasure to work well, and to keep ur lowend torque. correct? so the question is w. an off rd hpipe, and slps... ill have like no backpreasure whatsoever will i? or will that be sufficent enough to keep my torque at low rpms?

AdderMk2

your torque down low will suck.... and your car will sound like poo... slp's are too loud imho.... the lm2 isnt bad.... but its still too much

deanzawistowski

is my back pressure good with off road X and flowmaster american thunders

AdderMk2

if your still running stock headers and stock heads.. id say your sacrificing QUITE a few ponies

deanzawistowski

i still have stock head but BBK shorty headers

shaners90lxhatch

It's a myth that backpressure is good for torque. In only one respect is this right - it helps scavenge spent exhaust gasses at low rpms. And this is only a factor on engines with overlapping cams. Any factory forced induction vehicle will have a cam with little or no valve overlap so any backpressure is a bad thing. For what we use out cars for - backpressure should be considered only a bad thing. Anything 3psi or more will make your vehicle lack power, run rich, spark knock or even misfire. The cats are typically the bottle neck in your exhaust. Any system that does not include those expensive stinky little pieces of emissions crap will likely not be too restrictive