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Welcome to DRIVER pchaser, nice OB coupe! Why did you need the new plenum, they don't wear out? Since you have that beautiful '04 the best mod you can make is MotorDynes 5/16" spacer, that's HP increase you can feel and the best bang for you $$!
Gary
Gary
I got the Plenum Because it clears up the air flow issue that the stock one has it allows more air. What is the MotorDynes 5/16" spacer? what gains do you get or can expect? And whats the Price?
actually it is not a spacer its the crawford plenum. it does the same thing as the spacer but its all one piece. I got the plenum form a good friend of mine who had it sitting in his garage after he sold hs 03. here is the link to crawforZ
http://crawfordz.com/plenum-qanda.htm
http://crawfordz.com/plenum-qanda.htm








