GHL Exhaust w/Eisenmann Tip - w/Drone Killer!

[Specwar]

Originally Posted by Reebuck1

What size baffles did you order? Great idea!!

I got the 2 inch baffles but they make them in all of the standard sizes.
If your problem is REALLY bad I recommend using 2 baffles per pipe in at least ONE side.

Also they provide "choke" type fittings if you need a bit more when you order the baffle insert core.

A trick to kill drone as well is NOT to make them identical on each side.

A single baffle on one side or 2 baffles on one side and 1 on the other.
What you are doing in a true dual (individually from the headers) fed system where they exit side by side is to change the harmonics so while they sound the same to the ear but they are harmonically different to cancel out eachothers drone frequencies.

I hope that helps. The left and the right are a bit different in length on my insert cores.
You don't have to put them at the end they work at the intake point of the muffler as well.

[rfuerst911sc]

I also have a GHL that I want to tone down. It sounded great on the 3.2 but did have some drone. With Jake Raby punching it out to a 3.6 and I will be running straight headers and cat delete pipes so I'm going to make an assumption she will be loud/drone. I like the GHL tips so I plan on installing inserts into the muffler inlets. My car is currently at Jakes so I can't get a measurement of the I.D. of the inlet pipes. Are the inserts you purchased regular steel or stainless ? I assume the " core " is welded to the " ring " and then the ring is welded to the ID of the pipe ? I'm also wondering if the inserts/rings can be installed further upstream ? Like at the joint between the headers and the rear cat delete pipes ? I'm thinking in the cat delete pipe itself just past the flange. I love the sound of the GHL just want to tone it down some. If you had to guess what percentage of a difference did you notice ? Would you say it's 10 % quieter or 50 % or ??? And she still sounds good when you get on it ? Thanks for the write up.