Sucks to hear people are afraid of two very small 3" holes which are cut into material less then a few mm thick which they can't even see rofl. A complete amatuer could do this at home. Even though the cuts effect nothing, and would never be notcied unless people looked for them specifically. People are still afraid of it you are definitly correct though. But you can't even see the cuts, the cuts are under the headlight bezels. In fact the piping installation is better looking and more efficent, in my opinion then other FMs. Because of the mimimal bends and curves within the pipe, and where the inlet and outlets actually connect to the pipe, all seem to be best on the PSFM. the 3" in/out lets both point towards the motor, not away from it, or pointing out to the left and right. But again this is just my opinion.
But I still understand your point somewhat, people dont wanna cut anything this is absolutly true. But, its not like i "CUT UP" my car rofl, 2 small holes is far from a frame notch I can tell you that much! I wouldn't consider cutting 2 small holes in my car to be cutting up my car at all. But ill stop posting up, The original subject didn't even include the PSFM. Thought I would offer a "best performance" type of suggestion to answer his questions, which is what I interputted the thread to be. I just think that for the dollar, the PSFM has the best performace anyone can get out of a FMIC.
just my 2 cents, and I got them in so I'm happy, good luck picking a FM. Darkside