G'day guys. I wanted to put my 2 cents in as I've had a more positive experience with this exhaust. Firstly though comparing it to the competition you're getting a lot of metal for your money. You're looking at an extra grand for other brands for full stainless steel. For all 4" systems you have to drop the rear cradle. Regardless of brand. Fortunately I took advantage of this and fixed the diff bushes at the same time. Mines on an 09 G6e, with a GTX3582R. Last touch up tune it was pushing just over 400rwkw and flowing fine. My greatest limitation was actually the intercooler. These are a loud exhaust. They're race mufflers, next to say an x force it will drown it out. At full noise they have an awesome note. They can be a little noisey under load getting around town. Not excessive but the price you pay for straight through. Doesn't sound ridiculous like the mid muffler deletes tractors I've heard. My car is dumped on its guts. So it does scrap on the bumps. But then again so does the chassis. Being vband clamps you have to get it lined up properly otherwise it won't sit right. But once lined up it's not any lower than an xforce. I've had it on now for roughly 20,000kms. Had no issues with the welding, clamps or police! I highly recommend it, as I said at the beginning a lot of metal for your money.