• 330HP/300 ft-lbs of torque to the crank.

I am having a hard time believing these numbers 30HP over stock 300 and 42 ft-lbs torque over stock 258?


With them on it doesn't feel like a 330HP/300ft-lbs 911. It's definitely louder but I did not notice much difference in power.

 

I agree with your statement, I ran my car with the cat's and bypass pipes it sucked at the low end, then I ran cat delete pipes with Fister mod exhaust and it felt worse just gutless and not fun to drive.
Definitely sounded cool but NO low end torque!
I've now put my cat's back on and still running the Fister modded exhaust and the car is fun to drive again. I would actually like to put unmodded stock exhaust back on to see if that makes even more of a difference with the low end torque.

 

Yep. Not going to happen. I doubt if you would gain (provable) 10 hp from a change of that nature. Better to lighten the car than try to gain HP from bolt ons.

 

Great advice, I went the suspension/aero improvement route. I'm not going to beat big horse power cars in a straight line but throws some curves their way and the 911 will out perform every time.

 

Yeah, I would estimate 10hp as well at the most with any exhaust mod to free up the flow on a n/a car. 30hp seemed pretty high.

Everything is stock except the bypass pipes and a new software tune on the horizon. If I can bump up the overall hp from 300hp to 320hp with both add ons and go from 258ft-lbs to 278ft-lbs. I would be happy with that.

Next is the coilover system. I would get some new headers but the bypass is already at my loudness threshold and more. Some new headers I imagine would only make it louder? Or it's loud already and what's another decibel or some....