Hi Marcos

I have no personal experience with the TP04 pipe unfortunately.
I usually use a 1-piece "karting" pipe like the TP06 tuned pipe set (#2170).

It seems this pipe has been around for a while (release date in early 2002). I looked for TP04 information on myTSN, and found it at: http://www.mytsn.com/products/desc.asp?prid=2338

They say:
"This new TP04 version has been specially designed for the high-end .12 engines. As .12 engines become more and more powerful, new pipes continuously need to be designed to optimise gas flow and make full use of all that power available. The new .12 TP04 pipes are exactly what you need to optimise your high-end .12-engine performance."

A lot of marketing-speak, but doesn't say if this pipe is good for bottom-end, mid-range, or top-end.

While I hate to pass the buck, I would recommend contact someone at Serpent (Julius Kolff maybe) to find out the characteristics of this pipe.

Glenn Cauley
Ottawa, Canada