Its funny how Ive gotten a half a dozen calls a week by BOB pullers wanting to know how to get more air (BIGGER TURBO) and still meet there "RULES"... Because they are getting beat by a "STOCK APPEARING" Modified turbo... The issue there is lazy teching... If your going to have rules, you have to hold competitors to them.
As far as the restrictor plate idea... What do you think a 2.5 straight bore inducer is?
All the fuel in the world will benefit you nothing without the air... There is only so much air that will pass through the 2.5" bore...
S400's are getting used soley based on there durability... the S3 based and stock appearing trucks are still just as competitive. A 2.5 class still requires a good driver, and a very good chassis setup.
Stock turbo rules are pointless when they explode every other pull, again ask a BOB guy...
Workstock is just that... Workstock... guys run aftermarket turbos everyday, and tow heavy just the same... Parts are bought because guys want there truck to perform... thats the fun of it! Stock is no fun...
Its not rocket science... tech is easy if a 2.55 plug falls in... jump up. Theres no catering to who can hide the baddest stock appearing turbo.
Caleb
PS:
Will Dalenburg. Danville Performance, Stock Appearing DP VNT 2.5 Charger
http://youtu.be/wq9o8urx_ic
Josh Dellenger. Fleece Performance, S363
http://youtu.be/n0PAQhkhppI
Both trucks were built with bolt on parts. IE: Stock motor, no head work, no aftermarket rods. Anyone can build these types of setups and be competitive. A tech official can look at either one of these trucks, and in about 2 minutes know whether or not they are legal. Visual look for hanging weight in front of the bumper, visual look for compressed gases, 2.5 plug and done.
It gives the advantage to the drivers and there setups, not HP.