yeah altered atmosphere sucks ass,had them build me my first 4g63 engine,bottom end didnt last 500 miles and i was very easy on the car during the break in period.....took the car to some friends of mine that work for delta-v and mach5 and they said it looked like a bunch of retards with blindfolds built my motor...had to get a new bottom end cause the cylinder walls were scared up so bad they couldnt be bored out...ended up costing me about 7k.....fuckers