1st off, im amazed at how fast the new M4 feels compared to the e92, i dont miss the V8 at all, maybe just the v8 rasp after an exhaust, but the new one actually feels a lot faster in a straight line without reving too high.
The M4 also feels much more spacious inside for something reason. still need to configure the M buttons to my liking.

Ok on with the IPE exhaust, as one can see, its a gem :









carbon, blue flamed, anodized, etc.. many options for the tips too :



a video from the site :


a mustang dynoed 10+hp increase over stock which i really felt is faster than stock when accelerating and pulls much harder in all gears especially 1 thru 4th. Its easy to see why because they made the cat smaller and with a less restrictive resonater.
The exhaust gave the car a much needed throatier, meaner, and louder scream that it needs to go against 911s and fcars. It is now a nice sports car and not a gentlemans GT.
at first i think its a boring big sedan, but after this its