I recently installed the TR224. I had a 5177 on before the cam swap. Prior to install I dyno'd 420/535 on the gas. Dyno post install is 430/480. Both times I had the 100hp jets in. My NA went from 330/340 to 370/370. As you can see I lost some hp and tq. WTF? I know I should have gone with a rev. split....but I do mostly run NA. Should I lower the jet size? Any others with this problem?

 

You wouldn't want a reverse split for nitrous use. Definitely not optimum. You're better off with your tr224 or a traditional split with nitrous.

To me, it sounds like you are 10-15rwhp from where you should be NA. Which headers are you using again?

With a M6, your HP should be higher than your TQ with your setup NA.

 

I have Mac's w/ RT cats. I think the cats are costing me some hp/tq. Anybody with this same problem in losing hp/tq with the TR224 w/ nitrous?