I have a 2016 340hp car with a manual. The clutch was replaced a few years ago by a previous owner (so I'm told), but I do not know what clutch is in it. It's moderately heavy and works fine, but that's the extent of my knowledge. My question is around how cautious I should be adding power. I figure I'm likely fine up to 400hp, since this transmission came in the 380hp variant. From what I can find, the trans itself is rated around 400 ft. lb. But is there a general "feel" for what is safe? I'm more concerned about longevity of parts than every last hp since the car is purely street driven (my daily).
Thanks!

 

I believe we have a number of members with the 6-speed and a stage 2 tune (~450HP.) They can comment, but I don’t recall anyone reporting an issue.

 

I was happy with my stock 340hp 6 speed for 2 years then took the plunge and mapped it to around 420hp. The clutch is fine up to 550nm or 400 ft lbs.

I'd be more concerned about ensuring everything else is in order (coolant pipes, injectors, no ECU codes). Run an oil analysis as well prior to mapping to ensure there is no abnormal wear.

 

No clutch concerns as @WSHudds states above. I will be doing stage 3 and SC porting soon like @HermanWiegman :