There is tonnes of different exhaust types around, you just have to ask around and try to see as many dynosheets as possible!! There is heaps of different types of headers around, pacemakeers are obviously pretty popular. I just installed a set of advanced headers to my I6 and was astounded at the performance increase! Advanced is a south australian company, and the guy who runs it spends tonnes of time on the dyno getting the right result, these headers were specifically designed for use with the AU I6 falcon, all of the dyno sheets i saw from people that had used them had out performed pacemaker. It really is up to the individual to pick the ones they believe will suit their car, there is heaps around... I can more then recomend Advanced and am so wraped with the performance!
As for the rest of the exhaust... as cobra says, you need a high flow car really, 2.5" piping would be the optimium pipe sizing to use. If you have the money mandrel bent is the way to go!
I was recommended not to go for Stainless Extractors as i was told by a few people that it just causes unneccessary engine bay heat, for an unneccessary price, unless your planning on keeping your car for more then say 10 years, but ask around heaps and no doubt you will get some pretty good advice from here! welcome to the mad house!!!
AU2 S-pack Owner: Silhouette Black, XR6 Wheels, Tickford Sunroof, C2R rear bar, Checker Plate Floor Mats, Chrome Door Sills, Blue Backlite Dash, Blue Painted Brake Callipers, Advanced Extractors, Magnaflow High Flow Cat, 2.5" Stainless Steel Mandrel Bent Custom Exhaust, Genie Muffler. Sony Explode 50w x 4 deck, Kenwood 140w speakers (front and rear), Boss 1200 watt Amplifier, 12" Orion Sub in custom box. More To Come!!