[mkei]

Is a straight pipe better then a system with a muffler. For mpg

thanks mike

 

[Dad]

The performance systems all have flow through mufflers, so probably no measurable difference. If your rig is stock, I wouldn't go bigger than 4"..

 

[Ron's 02 Shaker]

Is a straight pipe better then a system with a muffler. For mpg

thanks mike

You might want to leave the catalytic converter and delete muffler.You may lose to much bottom end .Unless you buy a Smarty the youll be ok.Or just get a whole new system with flow thru muffler.Aloha Ron