aero_steve is right. Putting the exhaust on didn't do much (maybe 5 HP max.), until I put in the intake too. Combined I did get a significant increase in power. I don't really see the point in doing anything fancy and I don't care how mine looks...I just wanted something with better breathing. BTW, I have the Gibson exhaust without the tip installed so it looks pretty much just like the factory system from the back except I cut off the pipe shorter and twisted it up higher so it's less likely to get Mosi'd (my stock one had been Mosi'd). I think it was a worthwhile mod, but not soemthing I would do for looks. It's just an exhaust pipe!