I'm aware of and have searched on here,also saw the video of the baffle mod. I'm just curious if anyone here has actually done it,and what the before and after was like.Butt, and or traditional dyno.

 

Not sure what you saw but I usually bend 3 of the tabs. Previous to the mod my bike had a flat spot or dip in the curve down low. The mod completely eliminated that and the bike picked up as much as 7 ft lbs below 3500 and stayed the same above that. My bike is rarely below 3500 but throttle response felt better too. It also makes the tone a little more mellow and throaty when cruising. I've only dyno tested it on one other bike recently which was a stock 96" with 255s and it picked up 6-7 ft lbs down low like mine but also picked up 2-3 hp and ft lbs right through the top. My buddy also just did it on his dyna which has had a thunderheader forever and he said the throttle response and power off the bottom is incredible. We haven't gotten it back on the dyno yet though.
It seems like the healthier the motor is the less it gains up top. I'm sure there's a point where it might lose power up top on a bike that makes more power. I'm builing a stout motor for my bike this winter so I will be testing different things with the baffle and head pipe size and maybe circumcision to see what works best.

 

I've had a Thunderheader for years and have no idea what you're talking about, sure wish somebody would throw up some pics or a video or something.

 

Is this what you're talking about?

 

. Yeah man that's it exactly.Thats the vid I've seen before...pretty interesting results.

 

I didn't watch the video but if you look in the end of the pipe the baffle is a square shape. Grab a long punch or extension and hammer 3 of the 4 flats out towards the wall of the pipe. Fixes the common t-header flat spot.

 

I'm havin a hard time believing that theres NO downside to this, except for high HP motors as said previously.
Makes me wonder two things... why wouldn't Thunderheader make em like this and / or maybe they did and they, the baffles, are there to fine tune the pipe?

 

Good point. Thousands of dollars go into the R&D of the pipe and some guy on the video "improves" it with a hammer and a punch. Makes you wonder.

 

Might make you wonder til you see it flat out proven on the dyno and the street repeatedly. It is what it is. That's like saying because Harley spends thousands, millions on r&d for their screamin eagle heads that a porter cannot improve on them, they must already be perfect. After all these years thunderheader finally admitted the head tube size was too small for big engines and came out with a different style. That and the baffle issue has been commonly known for a long time. I wouldn't say their r&d is exactly on the ball. It's proven free horsepower, I won't argue with that.

 

You should watch the video. Guy bangs down all 4 and claims to eliminate the tq dip and gain more than 13 ft lbs of tq. according to his dyno run.