For my next car i am considering an B5 A4, B5 S4, B6 A4, or B6 S4. All are avant, quattro, manual. Which one of these engines would be the most realiable DD while still making 400chp? All I am trying to determine which would require the least maint. and least likely to fail. Obviously there would be other supporting mods (clutch, tranny, suspension, brakes) but I am only concerned with the engines at this point.

 

none they are all audi's

 

The A4 will be cheaper to get there and repair if needed. Plus its far easier to work on since you dont have to drop the engine to do work on it. You can make 400bhp with a gt2871r kit and all you need is a good tune, rods, and a clutch to hold the power. As for year, either get a 98-99.5 A4 with a AEB engine or a 01+ A4 either B5 or B6.

 

most reliable would be the b6 s4... its already got 325chp i think and its n/a...

 

B5 s4, upgrade the turbos to k04s and with a custom tune and a bit of fueling work you shoudl be at 400chp if not more.

 

you can make much more power than 400 to the flywheel with that setup... and that is by far not the most reliable option out of those imho

 

not to mention cheapest. Those kits are like $7k plus a pita to install. The B6 S4 is a V8 so it would be plenty reliable, but not the cheapest to get

 

^not to mention its also not that tuner friendly. I would def. get the A4 for sure like Cincy said if thats your goal.

 

B6 S4 is now capable of 489chp with a simple $9500 s/c kit. That is my new goal

 

^with that money, you could make an A4 just as fast if not faster then that, not to mention the a4 is way cheaper itself