YSR AFTERMARKET PIPES
Pictured from left to right and order of Low to Top End Power:
DG, TCR Twin Stinger, Toomey Racing, Pro-Flow, and Tommy Crawford Stage II

Test bike:  #50, Stock Head, 2nd over bore,stock porting, and TC airbox mods.
You can race with a stock pipe at Prairie City in any class. Thinking back I wish I bought my bike stock and tried competing in the stock class too. My bike came with a DG pipe so I thought I'd complete the makeover to  race supersport with Joe, Craig, and Alvin.  In a nut shell,  I only added the airbox mods(essentially 12 holes with a foam filter) and rejetted it. I found the difference was barely noticeable from a stock bike.   I might have to go the full 9 and consider removing the lighting coil.  But this would go against my primary goal to it streetable.  With the lighting coil installed, I am loosing about 500 rpms in the top and will have to live with the slower rev response.   Instead, I might have to modify the head for more compression and port my cylinder.  The latter I was told tunes the rpm powerband.  My friend had  his ported but his bike lost its lower end punch and increased its top end.  I will have wait until I can drop 10lbs in weight, or learn to increase my  cornerspeed before I go this route.  I weigh 175lbs and need the out of the corner speed acceleration.
VISUALS OF ALL THE PIPES
Two stroke engines utilize the "sonic" wave the pipe produces from its chamber.  I thought by just looking at the shape you could tell which pipe gave more low, mid or upper end punch.  They each have their own unique shape and produce power differently.  The big suprise came from the TCR twin stinger which has the smallest cone shape but made the best all around power.
STOCK PIPE
Idle
Rev it!
For an ugly pipe I think it gives pretty  good low to mid range punch.  I had a chance to test a stock bike at one of our Saturday practices.  Rob White of Team Intimidation Racing let me borrow a stocker which by the way felt as fast as my supersport out of the corners.  I think I had more top end speed.
DG PIPE
Idle
Let's fix it!
Rev it!
I think the DG pipe has been given a bad rap.  Craig and I were the only racers at Prairie City using this pipe.  With the right porting and head modifications to match it could be a contender.  Only time will tell if I go that route.

My only  real problem about this pipe is the aluminum nut that threads onto the cylinder.  Over time the threads weaken and strip from crashing or the heat from the cylinder.  It happened to Joe and Craig�s DG pipe too.  It is an easy fix though.  See link above!

Although it looks like an MX pipe,  it performs well on a track like Prairie City,  because it has a good low-mid range punch.  PC has a lot of corners which requires a pipe to have a good punch out of the corners.    During a race I could stay with people in the corners but I eventually get burned on the front straights.  It is a good choice for beginners because �we� tend to miss-shift and throttle off going into a turn when we first start out.  Advanced riders have good braking and corner speed so they can use the "pipier pipes" such as the  Pro Flow and Tommy Crawfords.
TEAM CALIMARI TWIN STINGER
Idle
Rev it!
I purchased a used one but yet to try it out on the track.  The original owner of this pipe told me it has good power from low to mid rpms.  Another racer told me it is similar to a DG but has more top end.  I got a chance to test it on my local backroads and can tell this pipe will be one of  my top choices for 2002.  I was surprised because the chamber is the narrowest of all the pipes.  I still don't understand how it makes more power in the low to mid rpms.  It still had top end to boot.  I can�t wait to race this pipe in 2002.
TOOMEY RACING
Idle
Rev it!
I purchased a used one but yet to try it out on the track.  Joe has one and last year I could stay with him in the corners and lose to him on the front straights when I raced him with the DG.   I feels like the TCR Twin Stinger pipe.   I�ll probably use this pipe or the TCR for 2002.
PRO FLOW
Idle
Rev it!
I purchased a used one but yet to try it out on the track.  The original owner of this pipe told me you have to keep the rpms up to get the most power hence, advanced riders would find this pipe as their choice.  I tested it on my bike and found the comments to be true.  The powerband came on strong towards the upper end of the rpm range.  The difference from the DG, TCR and Toomey is that engine felt more stable at high rpms.  The engine felt it could run like this all day.  However, when I hit the twisties, I found myself having to double clutch to find the power.   I think this would be great for tracks with more long straights.  Like I mentioned before, PC has  a lot of turns and I don't think I would be able to utilize the powerband of the pipe as well as advance riders who have good riding skills and carry lots of corner speed.
TOMMY CRAWFORD STAGE II
Idle
Rev it!
Although it is still in production, prepare to wait 3 months after ordering one. The Stage II pipe is designed for a mildly tuned motor.  I guess I couldn't realize the benefit since my engine is relativly stock except for the airbox mod and dynojet.   This seems like a popular pipe amongst advanced racers.   Supposedly this pipe creates the most hp of all aftermarket YSR pipes  however, it creates it at the upper rpms like the Proflow.  Maybe after my riding skills (read as increase corner speed and lose some weight)  get better I will try to race with the Proflow which seems similar to the TC Stage2.
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