Exhaust Pipe Identification

[WOODY8750]

I have multiple exhaust pipes off of the "fire" series of sleds and there appears to be two different designs?? Can anyone tell me anything about the two designs and possibly the performance values of them? The one style of pipe has an "L" welded on the top of the main body directly above the exit pipe and the second style has around 4" welds running parallel to the body right behind the exit area on the top and bottom of the main body. The pipes appear to be the same on the outside except for these two "features" but the inner designs are very different. I am building a vintage race machine for this winter and am looking for the best performance "stock" exhaust. Any help or advise is greatly appreciated!

[nick80lf]

The pipes with the "L" were used on 80-84 liquifires.

[WOODY8750]

Were the "L" pipes considered a higher performance pipe?

[JD600]

I don't know if higher performing is the way to put it. 2 stroke exhaust design is a very technical science. Each of these pipes is tuned specifically for the engine it was used on to give it the best power curve that Deere could achieve. In my opinion, they are best left on the engine they came off of to get the most out of them. Switching them will probably gain you some power in some part of the power band, while loosing it in another. Just my $0.02.

DE

[That Girl Racing]

The Liquifire pipe makes power at a higher RPM. It is a "shorter" pipe than the Sport or Trail pipe. The shorter the distance from the rear cone to the piston face the faster the sound waves will reach the open exhaust port. Too short or too long a pipe and the sound wave hits a closed exhaust port and you lose the supercharging effect.