Yep, I'm with Henz mate, get a sound clip up ASAP! I first tried an Xforce 3 inch system and to be honest, it was terrible....the drone between 1500-2500rpm was enough to want earplugs and it hit the tailshaft so needless to say, it got pulled off the next morning and sent back...thanks but no thanks! I ended up going for a hurricane 2 1/2 inch system and it is great, no drone at all and a good bark when getting stuck into it and I used the standard tips so it still retains the factory look. I was a dissapointed to say the least as I had an xforce system on my previous ute and it was great.....maybe I got a Friday built exhaust on the GS!