VTR Exhaust Modifications
A cheap & easy modification to the VTR exhaust (that was originated by someone on the SuperHawk mailing list) is shown in figure 2. This involves cutting a large hole in the rear baffle plate and extracting the whole attached inner pipe that goes all the way into chamber # 3. This actually eliminates both the 2nd & 3rd chambers as reverse-flow, but the 2nd chamber is now a direct flow path to the exit. This mod sounds pretty good, but is too loud for my tastes & the sound meter at Laguna Seca. :-(
The Catfish-designed modification is shown in figure 3 below. Here we re-insert the shortened output pipe & weld in a new rear baffle plate. This is a 2-chamber, reverse-flow design now that gives a nice moderate sound & should be OK for track days at Laguna Seca. :-) As usual, this great work was done by Earl Minkler at Valley Machine in Livermore, Ca.
Last update; August 29, 2005
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