I still don't feel like it's a must do mod and probably won't ever end up getting one. My mods include meth injection which is a big factor in keeping the car running a bit cooler. You can say blah all you want, but when my cruiser lined up with a cruiser running the plastic manifold, after the quarter mile run was done we parked next to eachother and his manifold temps were over 20 degrees warmer than my aluminum manifold's temps. I'd rather experiment with the aluminum one and port the hell out of it first then I'll go from there.
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O4 PT Cruiser non GT
Stock b****es, come get me
Sporting new Nikon D40 w/18-55 & 55-200...it's a learning curve that's for sure!
SoCal's fastest PT Cruiser 
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