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[workingdan]

OK i have a 2007 SEULTRA, I am running a thunder header 2 into 1 now and i am thinking of changing to a D&D fatcat with bigbore quiet baffle When I port my heads. I am also raising compression to 10.25:1 and installing a 625 cam. My question is, Is the fatcat going to be louder or quieter?  How much more power do you think i will get over the thunderheader?

[hd-dude]

The TH may have the slight edge on peak numbers but the DD will give you better low and midrange performance. The TH will be louder as well. For quality and fit and finish you cannot beat the DD.

[TimBone]

Yup, just like Jim says, go with the D/D, very quality piece of gear and the performance is awesome!

[Godeater]

Never forget that the TH have non-removable baffle, so there is nothing you can do to tune the pipe.  The Fatcat has different baffles to choose from as well as being able to pull out and mod as needed.

[AXIL]

     select the pipe,then tune the engine not the pipe. imoh.   axil

[Godeater]

Not to be rude but thats a little like building 7 foot wide bridge then tring to figure out how to get a 9 ft wide truck across it.  Costs allot less to mode a baffle then change cams because pipe has to much back pressure for your build.  Since we are performance shop we see this allot with the untunable type slip-ons and pipes.  Thunder headers being the number one offender. Drilling couple of holes or shorting a baffle is a very cheap and fast way to fix back  pressure issues,  Or going the other way and adding more back pressure.  I'll dig up some dyno runs where simply changing baffle had major increases in hp, tq, or both.  Guess depends on what you want the end result to be.

[workingdan]

Thanks guys, I am ditching the thunderheader for the Fatcat with bigbore quite baffle. Bring on the power 

[AXIL]

     workingdan, dont give up on the thunder header to qwik, when you know what engine your going to end up 
with then select an exhuast system to fit your build. i know a few guys that want there thunder headers back.   
the d&d have a better fit and finish but who can tell at 80 mph. imho th runs well and sounds good. 
  get more input before making a move.    axil

[rednectum]

t-header was designed for 80 inches. not on par with the higher flowing engines today. it also is known for cracking.

winner is fatcat! fit, finish, overall quality kicks some serious t-header ass. and it will make BETTER power!

[AXIL]

  rednectum, my twin cam is not an 80 ci. and it runs like a raped ape, you what to try again...   axil

[rednectum]

axil, i think you may have misunderstood. i didnt say a mild twin cam wouldnt run good with a t-header. when you step up in size or power, the t-header starts to fall short compared to other "newer design" pipes. 

t-header has proven itself over the years, but unless it has been redesigned lately, the base design was for the 80 inch motor.  nothing sounds like the t-header, gotta love that.

[AXIL]

   rednectum , i again dissagree. the thunder header was made for stokers not an 80 cid motor, i humbly say- please
rethink the facts on why the thunder header has come to be!!!!! on an 80 inch motor the thunder header is almost a
wast of money, mine is a 103, an i'll match it to any 103 out there. i may not win but i'll be rubbing there tail light.
 the d&d is a great exh. and so is the thunder header, but let's get the facts straight. I think you have been
misimformed.             axil

[DCFIREMANN]

Well as most of you know I am a true fan of the Thunderheader and have been for years. I do not run one on Ole Punkin anymore, not because I don't want to but when I was building the motor I was worried that it would peter out on top end with a big inch motor. I am now rethinking this as I am going to need to tune this motor in a few weeks. I know in the smaller motors a Thunderheader will out perform a D&D on top end. Once I try it on a built 113 we shall see as I already have a baseline for the Fat Kat with a performance baffle. OH and BTW the D&D Fat Kat with a performance baffle is much louder that the Thunder Header. I PROMISE!

If Rich Products would increase the tube size of a Thunder Header to 2 1/4 inch it would be the ticket for sure!

Be Safe

THE DAWG

[hd-dude]

For what's it worth I am a Rich Products (Thunder Header) and a D&D Dealer. I have installed both many, many times. They both work well and are great performance pipes. My choice? D&D. Why? Quality, fit and finish. I cannot tell you how many Thunder Header brackets, pipes, and heat shields i have replaced due to breaking, cracking. I have not yet had a D&D failure. I do sell about 3 times the TH product to D&D even though it is more $'s. Around here (Rich Products is local), They are the standard pipe on most bikes.

[AXIL]

  hd-dude, I agree with the fit&finish but the beauty is in the flaw's. I have no problems with there pipes or mufflers,
 but I've had a few heat Shields clamp mounts break. but none the less some one says the thunder header is for a
 80 ci motor is a bunch of bravo Serra...not just my opinion but my experience.       axil