Wow, it's a tough one. I like Capristo and they run for about 6g. They don't have down pipes though. I would go with Fabspeed and ask them for a custom muffler too. Your ECU is already tuned. So you should be near 650hp after the exhaust. Superlative tuning in Newport Beach has sways bays and intercoolers that are directly bolt on if you want more performance. Deltavtechnologies in Texas also have high flow air filters . My best recommendation is just getting a better exhaust system. It's really crazy to try to lighten a CGT for performance. Too heavy as is. You will have to have carbon fiber work done on exterior and interior and she will still be a cow. Enjoy her as is. Definitely get her to sound sexier though.lol

 

I wasn't saying that I wanted to make it a sports car. I was just wondering if there was any "low hanging fruit" for ECU tuning, etc. I tuned my G63 AMG and went from 536HP and 560TQ to 669HP and 734TG....that's what I was looking for to see if it was available.

 

For a 2013 Speed CGT. Yeah that is possible to get it up to 700hp by changing the exhaust and tinkering with the ECU. I guess you would have to weigh the difference in dollars for that extra 100hp. Look up Jayson Cohen from DeltaVTechnologies in Sugarland, Texas. With the ECU tuning. Now what you have to think about is will this void your warranties.

 

They can only void warranty coverage if they can prove it caused an issue. Anyway, it doesn't sound like I can get much bang for the buck so I doubt I'll do ECU tuning anyway. Maybe an exhaust for some extra horsepower and the louder sound.

 

Exhaust will sound good. You will love it.