Originally Posted by lucid
ebuyuk. no, i have not "seen" the M5 headers, but i wouldn't judge their performance by the way they look. can you point to data from an independent source stating their alternative indeed increases hp drastically? (not from the manufacturer who makes them or the people who spent good money to acquire them)
There is plenty of independent data. http://www.m5board.com/vbulletin/forumdisplay.php?f=27
Try searching here under "supersprint headers" or " evosport headers"
Here is some good info on supersprint headers http://www.m5board.com/vbulletin/sho...835#post841835