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Originally Posted by diver9000
Add some knology hotwires, and that will give you about 7-10 extra also. You could probably go with bigger duration cams without spending a fortune too. That will make a big difference.
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Ah ha ha ha ha sure dude, 10HP from friggin wires. That made my day!
The Corolla S is the same slow motor as the Matrix Xr. If you want more power get the XRS, either matrix or corolla it is significantly faster.
If you want to mod your matrix adding an intake, header, and exaust will make a noticable power difference, but to really make a difference you need different engine management. Oh and if you are going to do anything, buy brand name parts, not ebay shit. Most people who are disappointed with their performance parts bought junk off of ebay instead of researched products.
Good luck!