the test pipes only have a rasp for a slight moment (2600-2900rpm) under medium acceleration. but i loveeeeeeeeeeeeee the sound of them. super aggressive and almost like an exotic at the higher rpms. am i the only one with test pipes on the 370 here? as for my service engine light, i will try that ss wool this weekend maybe. if that doesnt work i will do the other fix when i have time (probably a couple of weeks). the light hardly bothers me anymore. the sound and performance of the pipes far outweighs the annoyance of the light.
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