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HeY everyone i just got a 00 s4 and so far i have done minor bolt ons to increase the performance. Such as pes racing bypass valves, uuc short shifter, eibach and bilstein combo suspension, scorpion cat back, not the tap performance one the real german one. I am currently looking for an intake for the spring and a set of piggy pipes so if anyone can help that would be greatly appreciated. Thanks alot
 

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hows your uuc short shifter? Is it a significant upgrade? Also, how does it look in the S4, are there pictures online i can look at too see what it looks like? Thanks
 

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One of the easiest Horse Power mods is replacing the stock bypass valves with Audi TT 225 Hp valves---they are relatively cheap ($35.00+/-). You have already done this with an aftermarket "pes" valve. I don't know the track record of these valves so let us know. I know the TT valves give about 1 ATM of boost whereas the stock S4 valves are about .6 to .7 ATM ( 14.7 lbs of boost v. 9.55 lbs) This gives a noticeable difference in performance.
 

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changing the Diverter valves do no increase HP, it might increase response but not HP
people up grade DVs because when they mod the stock DV can not handle the new boost
 

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Hey, I have the Evo intake on my 01 S4 and I love it. I definately noticed the difference. In throttle response and sound.
 
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