Originally Posted by RanRich

Short tails/axle back mods have zero effect on passing/failing. Test pipe runners will either swap them out or get the car inspected at a shop that will pass it with a wink. Ask around - almost all local forums or FB groups have a section on this.

As for GT Haus, if money is no object and you're dead set against a full catback go ahead. For that price you could also get a Motordyne Shockwave E370 system which sounds incredible - have heard in person and can vouch.