I don't know if there's much more potential behind the 1.5 you got there. Stay away from the venom 400. I guess you could have your ECU chipped and tuned if you really wanted to. There's not much need for it unless you got a cam and cam gear and valvetrain etc. I happen to have the DC header for your engine thats never been used bacause I blew my 1.5 before I got a chance to put it on. It's a 4 2 1 with all the hardware and o ring gaskets. I don't think many companies make a manifold and TB for the 1.5.