Define best.......in quality?....sound?...performance?....price?
Milltec, Magnex are good quality, performance is good, sound is ok and price is high imo.
Sebring are excellent quality, excellent performance gains and sound fantastic...if you can live with the price (BB on mine retails at £359

) but I've had the other 2 above and they are nothing compared to this...again imo.
Just stay clear of powerflow or other custom makers. They haven't spent the £Â£Ã‚£ the others have in developing thier systems and you may get a good sound but performance will suffer. I've got a powerflow centre section that has blown the filling out 3 times...luckily the freeflow matches the Sebring really well so got lucky, but never again with them
