Hi Eddie, I fitted an APS stage one unichip and got 295kW at the engine, then I chopped out the centre muffler, 1st to straight pipes then 2X2.25 nine inch hotdogs, fitted a cold air modification and a K & N filter, all I did was spend lots, lose 20 kW, and made the car sound like a dog. Ended up putting a 2.5 inch mandrel bent stainless from the cat back, still can't find those kWs again though. If you do cut out your centre muffler make sure you keep it, they cost over $400 to replace. If I was going to do it all again, I'd be waiting another six months to see what APS, AVO,CHIPTORQUE, and CAPA, come up with in their final analysis, there seems to be too much confusion and experimentation for my liking,e.g rumours of weak valve springs, loose turbo housings too hot intercoolers, too small injectors, etc, etc, etc, etc, etc, etc, etc, etc, etc, etc. Past wisdom says just like in the days of the good Ol VL Turbo, if you give these guys 18mths or so they will finally sort it all out, if you try to find performance on innuendo, experimentation, and hear-say, you may just be in for some frustrating and very expensive . The best gains I've ever had were in a VL turbo that Lachlan at Chiptorque did in about 92. But I got posted way over here to the wild west, where the fuel is crap and the drivers are slow. Oh to live in Qld again then I could just pop down to chiptorque on the Gold Coast and I'd have a very quick and drama free car. I only went for the UNICHIP because they have a dealer in WA.