i herd stuff about melting donw your motor with strait pipes on 2 strokes does a strait pipe give u more power or not?

 

No , you need a specific expantion chaimber for low or top end, it s very important on two strokes. 4 strokes are another story.

Jim

FYI...
Component: Pipe
Low To Midrange: Fatty or Torque
Midrange and High-Rpm: Desert or Rpm

Component: Silencer or Spark arrestor
Low To Midrange: Short, small diameter
Midrange and High-Rpm: Long, large diameter

Aftermarket Exhaust Pipes
The exhaust pipes of high-performance two-stroke engines are designed to harness the energy of the pressure waves from combustion. The diameter and length of the five main sections of the pipe—head pipe, diffuser cone, dwell, baffle cone, and stinger—are critical to producing the desired powerband. In general, aftermarket exhaust pipes shift the powerband up the rpm scale. Most pipes are designed for original cylinders not tuned cylinders.
There are two reasons for buying an aftermarket pipe; to replace a damaged pipe or to gain performance. The stock exhaust pipes of most late model Japanese dirt bikes offer excellent performance. In fact, many aftermarket pipes are just copies of OEM pipes. The reason nobody buys OEM pipes is because they are way too expensive. There are several different manufacturers of pipes in the world. Generally speaking, the pipes manufactured in Europe (SPES, DEP Sport, MESSICO, HGS) offer greater high-rpm performance at a much higher price ($350) than the American pipes (FMF, PC, Dyno-Port, Bill's, R&D). The European pipes are designed to work in conjunction with ported cylinders whereas the American pipes are designed to work with stock cylinders.
Pipes are available in two types of material, steel and aluminum. The steel pipes are made in bare and plated finishes. Plated pipes require no maintenance whereas bare metal pipes require constant maintenance to prevent corrosion. FMF's new Burly pipe is made of thicker steel and resists rock dents. There is no performance difference between the two finishes. The energy of the finite amplitude waves reflecting through the pipe is not affected by surface finish. However, sharp edges and abrupt transitions between sections of the pipe affect the fuel/air particles carried by the waves.
It is possible to determine how the shape of the pipe will affect the performance of your bike. The pipe manufacturers label their pipes with terms that describe the pipe's affect on the powerband. Terms like "Fatty, Supercross, and Torque" are associated with enhancements in the low to midrange of the powerband. Terms like "Desert, motocross, or RPM" are associated with enhancements in the upper midrange and top end of the powerband. Generally speaking, pipes with designations such as this work well with cylinders and heads tuned for the same type of powerband. It is unusual for a "RPM" pipe to work well with a "torque" cylinder.