It does not appear there will be a tune for GT or DH. Aftermarket companies have them available now. I purchased Palm Beach Dyno tune with RTD4 for my DH. See dyno below. Not saying this is the best, just that this is the ball park with a non modified car on 93 oct.
I have not tracked car, but car handles fine. Now i still have Pirelli Pzeros. I live in a rural area and normally increase speed through corners with no issues and high speed driving feels comfortable.
The 305/35-19 Pirelli Pzeros fit the stock DH 10in rims per manufacturer specs. And they look fine on the rims. 305/30s are not recommended for 10in rims, so wider is required.
I did move rear 275 pirellis to front and installed 305/35 pirellis for rears. No problems on non HP DH wheels. I did not want to buy new wheels, but wanted more rubber.
There 4-7 mm screws. You need a person with small hands and arms. I used a racketing wrench with tape, space is limited. Only lost one screw.
I replaced black pony with factory bronze pony.
Installation was easier than i expected, but your dealing with HPtuners first and then Palm Beach Dyno. I set up an account with HP tuners and downloaded their app on my phone. You buy RTD4 credits from PBD. Once PBD sends RTD4, you have to sink with app, then copy your factory tune. Email...
Just confirmed 8,000 redlne. It appears throttle response is very noticeable in normal mode (from throttle and tune). Will check other driving modes. Seat of the pants feeling in other modes, more giddyup and go at peartisl throttle. When I went out to practice 4th gear data log, I was...
This is video they posted. Being a daily driver, i'm looking at low to mid range torque, not peak hp. Also, area under the curve, not peak. I'm not saying they are the best, only that its an option and reasonably priced.