Making a 914-6 Conversion your own, The Quest for Quiet Options

[Root_Werks]

The Six Conversion:

2.7 CIS with 993 cams, 46/40 valves, 911S 8.5:1 CIS Pistons with Nikasil cylinders. Guessing it produces slightly more than stock 2.7S HP and has a much lower, broader TQ curve.

Current exhaust is stock 914-6 HE's and one of Ben's SS Quiet mufflers. Been very happy with the exhaust note the past few years, but always wondered if stock would be quieter.

Ben's Quiet Muffler ( I did have to reclock the tip as it was more for 1974-up 911):

[JamesM]

If you want to maximize sound comfort, before you put your rear window in completely strip your interior, tar boards and all, and spray every metal surface with Lizard skin including back side of the dash frame and pedal board (if you have a metal one). It takes all the resonance out of the cabin surfaces and gives the car a very solid, high end feel. Then you can add all your additional sound blocking pads back over the top of it.

Time consuming and not cheap, but worth it. I did it on my autocross car and even without adding any additional sound blocking on top of it made a huge difference, bonus it doesn't weigh very much.

[mb911]

If you want to maximize sound comfort, before you put your rear window in completely strip your interior, tar boards and all, and spray every metal surface with Lizard skin including back side of the dash frame and pedal board (if you have a metal one). It takes all the resonance out of the cabin surfaces and gives the car a very solid, high end feel. Then you can add all your additional sound blocking pads back over the top of it.

Time consuming and not cheap, but worth it. I did it on my autocross car and even without adding any additional sound blocking on top of it made a huge difference, bonus it doesn't weigh very much.

I didn’t do that I used noico sound mat. Still too noisy for me with the roof on.