Well im new here but I give you my opinion. I bought some FRPP shorties and after sitting around for ai while I decided if I was going to do it to go for the long tubes. Keep in mind this was my first mod to my car. After what seemed like a 3 day nightmare come true I finaly got them on and test drove it. I also installed 50 series flows with them. Honestly I did feel a gain in acceleration but not enough for the pain and agony of the installation. I also lost money on selling the shorties. Thinking back now, I would have done the shorties. By the way to this day I still have to retighten the bolts and let me tell you Its a PITA!!!. If your going to do longtubes pay someone to do it.