Let me start by saying i bought a 3 inch single shot exhaust from jack cotton about 3 months ago i guess. Well i decided i wanted a 3 1/2 inch downpipe and and exhaust. So i call jack cotton back up and asked if he would take the exhaust back becuase i wanted a 3 1/2 inch downpipe and exhaust. Get this, he said as long as it hasn't been installed i can take it back . Now heres the kicker, i asked if he could make me a downpipe and exhaust a 3 1/2 that is. He says i can make you something up. So after shipping details we decided to just exchange the exhaust in indy this past weekend. Well for those of you who was at indy i don't have to tell you but for those of you that was not, i got to his vendor booth and not only did he make a sweet a$$ exhuast but he made it 4 inch I want to take this time to thank you jack on another sweet product . It is great to have awesome vendors like jack cotton and his son. I have had nothing but good experiences and products with them. So for some stop beating a dead horse, he is one of the most standup guys i have met and informative. I know there are other vendors out there and i have dealt with them also but this guys has to be one of the best, so beware of the pumpkin performance center!!!!!!