Exhaust mods?

[bakers211]

I bought an 07 Speed Triple several weeks ago. I've been researching the bike intensly, specifically what modifications I can do to the exhaust. I tried looking at the threads on this site but just got more confused. It sounds like there were two different exhausts for 07 Speedys. However, I'm getting confused about the idea of removing the pre cat. Where exactly is it located. Is it in the header, before the foot pegs and the oxygen sensor or is it after the O2 sensor? Would it be eliminated if I put on a Mivv or Leo Vince single slip on?

[dblhelx]

In 2007, part way through the year Triumph changed the header pipe bend, relocated the O2 sensor and relocated the pre-cat. I have a later 2007 and the pre-cat is in the mid-pipe (medium size section of pipe between the header and the exhaust. One sign you have this is your bike came with a shiny lower heat shield with slots in it to cover the O2 sensor, behind that shield the midpipe has a buldge and that is where the pre-cat is.......and on this model it is a HUUUUUUUGE pain in the ass to get that ****er out...tried it....broke down and bought an aftermarket mid-pipe with that stuffy pre-cat removed. I went with Tridents dual high mount carbon fiber cans with their mid-pipe.

Pretty much, for the MOST part, all slip on cans will give you ROUGHLY the same performance gains....just a matter of the various sounds you like, and whether you want a single low mount can or a dual high mount...personal preferance.

If you have an earlier 2007 and older bike....the pre-cat is at the end of the header pipe where it connects to the mid-pipe and this is far easier to get out, although still a mild pain in the ass, but very do-able.

The pre-cat is like a tightly packed honey comb stuffed in one location of the exhaust pipe, place depends on the year as outlined above. It tends to restrict air flow and slightly impede performance. Removing it and reprogramming your bike's ECU to recognize there's no more pre-cat will add a modest gain in performance.

[bakers211]

All of the sudden I feel enlightened! Seriously, that cleared up alot for me. I must have the early 07 because there isn't a heatsheald. I guess I'll get to work on removing it when it gets warmer. Then I'll decide on a slip on and get it mapped afterward.

[crashmasterd]

What he said is more or less true, except that the true "Precat" is not a honeycomb like he mentioned. The later 07's actually had a true catalytic converter in the pipe and that's what he is removing. The earlier exhaust had a little perforated steel tube just in front of the junction between the header and the half system. According to Triumph it was coated with a catalyzer, thus it is called the "Precat because the factory silencers have a true Catalytic Converter inside them on both models.

[dblhelx]

BAKERS: get your exhaust cans FIRST....that will make the most difference as far as any performance gains and a cool sound, as well as lose some significant weight, especially if you go carbon fiber...the stock cans weigh a TON. And THEN you can get that pre-cat out.

Well, looking in my later 2007 mid-pipe, in the buldge area right at the opening, I see a LOT MORE than just that older tube like thing...looks REALLY packed in there almost like a honeycomb....is it EXACTLY the shape of a honeycomb? nope..lol....just trying to give the dude some idea.

I helped a friend remove it on his 2006, was a bitch, but not THAT bad. On mine, it would have been a freaking nightmare and not worth my time.

[ddjones]

I bought a leftover 2007 last week. I was reading this tread and decided to pull the exhaust apart and see where my catalytic converter is located. My bike was built in 11/06 and the catalytic converter is located after the header. Unless there is something hidden from my view around a bend, the mid-pipe was unobstructed and if I looked hard enough the only thing I could see was the O2 sensor way back there. The catalytic converter has a corrugated steel with a catalytic coating material that blocks the intake and looks like a pain to cut out.

Here are some pictures I shot.

[ddjones]

Here are some pictures I shot.

[greenbollocks]

Pain to get out is an understatement. The folks who have the earlier exhaust have it easy. The easiest way to rid the late 07 cat is a replacement mid-pipe. Unless you have ait tools and an amazing amount of tenacity.

http://www.thespeedtriple.com/Forums...cseen#msg98061

[Devious2xs]

The catalyst is not honecomb, it is corrugated steel with a catalytic coating. Very hard to remove short of cutting the pipe in half and re-welding after removal (just like it was made).

True honeycomb catalysts are much better flowing, lighter, and cost much more.

[ddjones]

The catalyst is not honecomb, it is corrugated steel with a catalytic coating. Very hard to remove short of cutting the pipe in half and re-welding after removal (just like it was made).

True honeycomb catalysts are much better flowing, lighter, and cost much more.

Photos fixed