Hey mate nice ride. If your looking for some quick and easy mods to get then go for a full stainless steel xforce 2.5" exhaust with 100cpsi ballistic cats, pacemaker tri-y headers, an OTR CAI and a mafless tune
I reccommend GM Motorsport for the tune as they are well known for good tuning
I made 251rwkw just from a ramjet otr, tune and zorst so I'm pretty happy until the time comes for head and cam package
as for mike_07: 272.2rwkw is some big numbers from just an otr and tune on a 5.7L mate.. Iv got a few mates with 6litres that didn't even make those numbers. Any chance of getting pics up of your car and dyno sheet?