If you already have all the bolt on power adders and want to get more power, you can sweeten your power band with a set of more aggressive camshafts. Stock camshafts are designed for smooth idle and linear power curves, emphasizing bottom end torque. Depending on which camshafts you are looking at, these will create more mid range and top end power (stage 2/3) or will create massive top end power over stock cams (stage 4).

Its always fun to think about having huge amounts of extra power at high rpm, but its important to keep in mind that when you change camshafts, you are changing your entire powerband. The more aggressive the camshafts, the worse it will be to drive at lower rpms. Stage 3/4 camshafts are not fun to drive with in rush hour stop and go traffic! So carefully select your camshafts based on when and where you will be driving it. Race only car? Stage 3 or 4 is no problem. Street car? Maybe 2 or 3 depending on your mods and turbo. Check out the cam selection card in the photos.

These Brian Crower camshafts are designed for the Neon SRT-4 and 03-10 PT Cruiser but should be able to be used in a 2001/2002 non turbo PT Cruiser as well. In order to be used in a  01-02 non-turbo PT Cruiser, the cam magnet will have to be rotated by 90 degrees. 

 
Note: You must use Brian Crower valve springs with these camshafts. If you do not, your factory valve springs may fail, causing catastrophic damage if the valves were to drop and contact the pistons. It is not worth the risk! Purchase performance valve springs. They're not very expensive.