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DenverSteve · 11-08-2011, 08:05 PM

I believe I read this somewhere herein but I haven't been able to find it to follow up.

I drilled out my muffler this weekend and it made an obvious improvement. The tone at idle is deeper and "throatier". The volume on the road doesn't really change as it is not loud enough to hear. It feels quicker to respond and much nicer. I recommend it to anyone who wants a cheap (tools less than 100 dollars) exhaust mod with noticeable improvement. No negative noises. I drilled two 2 1/8" holes with a step-bit and it lets the muffler "breathe" better.

I read on another forum that the muffler "drill out" mod had been done. On the forum I participate in for 911's they had a car dyno'ed before and after showing between 25 and 35 RWH gain depending on the RPM.

11-08-2011, 08:05 PM	#1
DenverSteve Registered User Join Date: Jul 2011 Location: Denver/Winter Park, CO USA Posts: 600	Muffler Modification I believe I read this somewhere herein but I haven't been able to find it to follow up. I drilled out my muffler this weekend and it made an obvious improvement. The tone at idle is deeper and "throatier". The volume on the road doesn't really change as it is not loud enough to hear. It feels quicker to respond and much nicer. I recommend it to anyone who wants a cheap (tools less than 100 dollars) exhaust mod with noticeable improvement. No negative noises. I drilled two 2 1/8" holes with a step-bit and it lets the muffler "breathe" better. I read on another forum that the muffler "drill out" mod had been done. On the forum I participate in for 911's they had a car dyno'ed before and after showing between 25 and 35 RWH gain depending on the RPM. __________________ Denver Steve Carrera, Cabriolet, 6-Speed, Black/Tan Last edited by DenverSteve; 11-08-2011 at 08:08 PM.