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Yeah that coffee can exhaust thing has been around for some time. Type R stickers add a further 20hp and NOS stickers add 100hp. How about some blue blinker fluid and dual roller muffler bearings for another 30hp?
If you want a REAL 50hp (and 40lbft) gain from your 4.0, copy the performance mods that I've done to mine:
ROFLMAO!!!!!!!!!!!! Somebody help me find my teeth...I spit 'em out when I checked out that site...But seriously...for that trick to work properly, you have to add a second, non-functional can to the other side to counter the vortex imbalance...dang i'm getting old. They make DUAL Roller muffler bearings now???? But i got the juice.. :jester: .Synthetic blinker fluid.