hey everyone, just gathering some opinions, feel free to add pros and cons and so on. I have an fg ute, currently at 360rwkw with standard dump and exhaust, these are the restriction at the moment as ive upgraded turbo, fuel, so on..... I know of a few people karl, riki, with the fg utes with same mods, that had the single 3.5" but needed to upgrade to 4" to flow better to achieve the potential of the car. I been looking at xforce varex mufflers, the ones with the valve the u can control remotly. (I like this as you can open it right up with no restriction at all for performance and noise, or have it closed where the gasses circulate 3 times before exiting with a sound claimed to be quieter or similar to standard. or anywhere in between). though I cant find that they do a 4" inlet to the muffler. so im planning on getting a 4" split dump with 5" cat, then going into maybe a magnaflow 4" inlet muffler and exiting in twin 3" over the axle and into a varex muffler with twin 3" inlet and twin 3" out. probably sounds like a crap combination, but im not very clued on with exhausts.