going in for the magic 300 tune shortly, will the factory exhaust flow enough with the addition of a high-flow cat?

I would like to give it a crisp note, but not overly loud. I can't stand the truckspec noises though.

I was considering trying something like removing the both mufflers and replacing the rear with an xforce stainless w/dual outlet.

any suggestions regarding both flow and producing a nice sound would be appreciated.

cheers

I think highflow cat will be enough for 300. Full Xforce are only like 1500 anyway.

I did cat and removed center mufflers and got 350rwkw...

High flow cat is definitely enough...

High flow cat is the go. Save your money on the rear muffler and leave it. If your worried about the volume fit some 2.25" resonaters (hotdogs) in place of the centre muffler. Sounds great

I made a little over 300 rwkw with a high flow cat and standard exhaust in a BF ute but the power wasn't reliable. I was really felt it at the drags and after removing the old spark plugs you could tell the exhaust gases were not escaping quick enough. Just installed a turbo back xforce 4 inch dump into 2.5 twin mild steel. I couldn't believe how quiet it is (after 100km of driving) and how much better the engine feels. Also your boost levels don't fall away as the rpm increase. I would strongly recommend getting a exhaust system if you want to make 300 rwkw safely. I know people may disagree with me but if you decided not to get an exhaust, after going to the drags or do a couple of track day pull your spark plugs out and have a look at them.

thanks for those replies, want to keep costs down so not going will a full system at this stage.

interesting post though Gee I will definitely consider that in the future.

the idea with the xforce muffler is that I thought it might produce a crisper sound being a mild steel system ending in a stainless muffler,

any opinions on that?

interested in the resonator idea DOHC6T, have you done this on yours? does it still groan like a truck or is this absorbed?

Edited 21/07/10 03:50 AM21/07/10 03:50 AM by F22 6T

I read a thread where the bloke said that the best sound he's had was mild steel pipes with stainless mufflers - gave a nice crack from the stainless mufflers...but every person has a different opinion about what sound good!

check out rage exhaust on xr8 on youtube

That's an XR8 though, sounds a lot different I'd say? Can be hard to find 6T vids of specific exhausts :(

Do it once, do it properly.

SMB/Manta full exhaust or GTFO!