that depends on which 2.4 head you use. the 01+ pt heads (non turbo. may also include stratus, im not sure) have a different exhaust port design which supposedly flows better. i say supposedly, because i really havent seen any dyno proof of this. the 01+ pt head has smaller, more squared exhaust ports in comparison to the earlier 2.4 heads (which are the exact same as the 95-99 2.0 neon dohc heads)