I have the stock exhaust with catted downpipe. Quiet in normal and in sport mode louder than stock but not obnoxious. Instead off upgrading exhaust use the money for Suspension upgrades
I wanted my car to handle corners and have more direct steering after tracking it stock. I installed Verus camber plates and HKS springs with Eibach sway bars with AFE endlinks and have an alignment after break in of the new suspension. The shop did my alignment did a great job. My car now...
Maybe reduce the rear camber to -2.0 to -1.9 and maybe 0 out front toe. On my car with springs camber plates and sway bars I have my Front -2.2 and rear -2.0
You're probably going to get a loud exhaust ticket and have to see a state ref to see if your car is legal in Cali. Im not an expert just learned it from you tube university lol. Besides that the Dinan exhaust looks and sounds good.
Just stand 6 feet away you will never know ?. Ive seen Wraps to PPF on many cars no matter what they do not come out perfect and are wear items. The lighter colored cars will see more imperfections. But I
have to admit that was a lousy job my front bumper does not have cut lines there. Remember...
I installed my AMS Catted Downpipe combined with the JB+ car is alot more responsive and louder on sport mode with stock exhaust. Only using 93 premium. So far no issues to report just a grin on my face at full open throttle.
The GR Supra out of the box is a fun car at track. Just get an alignment and go to the track. Everyone has different opinions on drivability and feel at the track. Just drive it at the track and see how you feel and see what you need.