I have a chance to pick up a Thunderheader 2 into 1 in almost new condition for a good price ($200). I believe the motor is stock. CV carb w an S&S air cleaner. I have shorty dual drag pipes that came on the bike. Will I notice any difference in performance on a stock motor?

 

With the motor being stock and you have an S&S. What i would be checking is if your rear pipe is shorter than the front. If you ever decide to have performance work done on your motor, It's a lot easier to tune a bike that has the same length pipes. Thunderheader is a good set up and the two pipes go into one collector

 

Love mine, you see its gains in the top end!
Plus nothing sounds like it!

 

Thunderheader is the best sounding 2-1 and will help now and better later on if you get the "tweak it more" in your blood. Check it close for cracks, it's weakness is other brands 2-1's workmanship is a little tighter, good pipe and they will hear you coming.

 

$200 is a good price. Like 1997 says, check for cracks and the mounting bracket on the collector. I have been running one for a while and like it a lot. The headers do run hot so you will either need sheilds or wrap them.

 

A 2-into-1 should give better performance than any other set-up, especially for road use. Think of the performance gains Buell got using one on their versions of the Sportster motors!

 

I really like it. I have seen 2 versions. One is for floorboards I think and the rear pipe goes straight down. On the other one the rear pipe swings forward and both pipes wrap around the ignition cone like Havoc's.

http://www.youtube.com/watch?v=Vf8eZTLHuMM

 

I wouldn't run any other pipe.

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I sold mine for $350 (1/2 price), so $200 is a very good price.

I like low-end torque, which it won't have after a few months old. They don't have much back pressure and burn-out too fast causing them to be too loud IMHO!
However, I got mine to work with a glass pack/baffle cut out of a hot rod glass-pack muffler, fit perfect and then it had torque and sounded better.
I sold it because I wanted true duals for that old "separate pulse" sound I missed. I know 2 into 1 is better for performance...hence X pipe, but I'm not racing, just like the old sound.
I now have real good low-end torque, love it!

 

Thanks for the info. I did buy the thunderheader. Gonna put it on sat and see how the carb behaves. I suspect I'll be rejetting. Good thing its still raining.