i personally love the slp tips. my friend had the slp's on his 99 cobra with a h pipe and it sounded aweful at times tho, it was very very raspy and crackly. i dont know what it was cuz a lot of people seem to like them and i heard them on youtube and i liked them on there but in person on his cobra it was a different story. I dont know if it was the h pipe or what but it made me and my buddy cringe everytime his cobra hit a certain rpm range.