I have been looking into swapping out my muffler system now for quite some time, I did the efans on the truck yesterday...... Not really sure my butt dyno noticed the difference, but my ears did, no more thermal fan chopping the air....( ok, maybe a slight hp increase in the top end with the efans, but for free it was a great gain, and a lot more engine room ) but if there is any way I can see /hear some driving vids with these magnaflows that would be great, and I'm not too worried about idle sound as I run a 114lsa, so it's not very lopey to begin with. It was my old boost cam and I am looking to swap out to a bigger cam, how big is safe before my PV clearance is gone