i recently went to a used car dealership and there i saw an integra gsr sedan for 7000 with limited warranty. has less than 100,000 on chassis but it has a b20 engine (currently unknown miles on engine), obvious mods dc 4-1 header. cat back exhaust, and ? cold air intake. my friend told me he heard there are problems with the b20 but couldnt say what they were. i wanna know what these problems can be. cuz other than a non b18 engine the car looks like its in near perfect condition