now i got my srt rear section! so i have a long tube header no cat 2.5 in. piping to the srt rear section. it was way too loud like that so i got this special glasspack that only my local muffler shop had its not quite your average straight through glasspack they said this style is more of a resonator than the old ones but anyway i welded that on right after the header and it sounds amazing. but my question is, is this enough backpressure for it? you can still see down the barrel of the glasspack but it is a smaller opening than the average ones.

 

is backpressure kinda overrated on 4 cyls i kno there does need to be some but is it really true that you have to have a lot? cuz i would kinda figure that just all the piping would be enough but idk

 

the only whay to now for sure is to tune it on a dyno.

SOme random info
http://www.flowmastermufflers.com/backpressure.html

Posible neg effects

By reducing the backpressure, some amounts of raw fuel (and fresh air) will be "scavenged" into the exhaust system. So by reducing the amount of air and fuel in the cylinder at the time of combustion.

1A degree of cylinder pressure will be lost (a decrease in available torque)
2Effective air/fuel mixtures will be leaner (possibly leading to parts damage).
3Ignition spark requirements will change.
4The exhaust system's temperature will rise (owing to the burning of air/fuel mixtures in the exhaust manifolding and pipes).
5Exhaust gas temperatures will increase (particularly notable during engine dynamometer tests).
6There will be a tendency of back-fire (or popping) during deceleration of the engine.



And while other conditions may arise (depending upon how a given engine is configured), the ones listed here are probably the most common.