DIY Exhaust Mod – Gain of 10+ HP!!!

[The Radium King]

Originally Posted by particlewave

I'm going to go right through the top of the muffler and into the inlet pipe with one or two 1" holes.

i wonder if you could go in via the entrance pipe to drill the holes - similar to the crios mod?

if you do as you say, perhaps a couple of 3/4" knockout plugs to fill the hole - no welding required, do it while the muffler is in the car?

[particlewave]

Originally Posted by More

Thread needs more pics for us 97 to 99 Boxsters. I need to see where exactly to drill the holes.

I'm not completely convinced that it does anything on the earlier mufflers because of the sound deadening material inside.

Originally Posted by The Radium King

i wonder if you could go in via the entrance pipe to drill the holes - similar to the crios mod?

if you do as you say, perhaps a couple of 3/4" knockout plugs to fill the hole - no welding required, do it while the muffler is in the car?

I will definitely look into this. It will be after the 1st of the year before I get to it. If I can't get at it from the inlet, I'll go through the top (don't want the plugged holes to be visible from the bottom).

[More]

Any 98ers on here that have made this modification?

Does it work?