I gotta be honest with you. Im sure the hot shot's are great quality header but the design SUCKS. the problem is they tried to design the header to connect to the stock midpipe. This was a huge mistake. if you look at any other 4-1 header for the 4 cyl tib (or most other 4 cyl car's for that matter) you will notice that the primary tubes are roughly 3 feet long. ANY other header will also come with a new midpipe and flex pipe that is larger than the stock unit. "tuning" of the header is determined by the lengh of the primary (and in the case of 4-2-1 headers the seccondary tubing) The idea of a header is that as a gas pulse passes through the collector it creates a venturi effect that creates a vaccume pulse that moves back up the other primary's. this vaccume pulse must be timed for the rpm range you wish the header to be effective. the longer the tube, the longer it takes the exhaust pulse to make its way down the collector and the longer it takes the venturi pulse to make it back to the head. therefore longer primary's mean low rpm power. short primary's mean high rpm power. the problem is that the hotshot's have primary's of roughly 1-2 feet long. that mean's that this header is tuned well above the tiburon's max rpm and the only gains you will see from it are from the removal of the cat converter. for the price, you could buy a well designed header and have much better gains. that's my dolla fitty on the hotshot header.