Who makes them and where's the best place to buy?

 

Made by Supreme,here's the best place to buy @;
http://www.ninosport.com/Supreme-GT-...=2&category=90

 

Maremont / Supreme Performance.

 

+1 - I have about 500 miles now on my GTA's on my '07 GT/CS and they are sounding better all the time....plus they fill the rear valence cut-outs soooooo much better than the 3" stock tips...that alone is worth the $$'s and the great sound is an added benefit

 

+2 - did the same with the black grill paint before I installed them. At least the muffler section is not poished like on the MagnaFlows....nice quality - but you could really see the mufflers under there

 

Same here - I even had to enlarge the slot a bit on one side so the factory "rivet" that's on the center pipe end would slide in for mounting.

 

I've had my GTA's in for a few months now and I love them. No drone, but I did get a little vibration right at 1000 RPM occaisionally. So, I did the fix mentioned in the TSB. Hose clamps to snug up the tailpipe mount. I also took apart the console and side pillars around the radio/HVAC controls. The vibration comes from one of those plastic panels being vibrated. I put a few dabs of clay where the plastic parts touched (and were out of sight). Actually what I used was a few pinches off my Mother's California Claybar. Works great. No more noises at all.

 

GTAs received today at 10:15 am... installed by 11:15 am and my test drive is complete.
At idle and cruising they are just a touch louder. Any pressure on the throttle and they immediately get louder and deeper. WOT is very nice. Overall, they have a deeper tone, the motor boat at idle is almost completely gone. I think the sound is more refined... more what a V-8 should be with out being too loud and waking the neighbors at 4 am.
I am very pleased with them. They are just what I was looking for.