Hello! This is my first post. We have a 78 micro mini with a 20r engine. I just had some exhaust work done but the guy was trying to charge me a bunch because he thought j was crazy. I read that people were running 2.5" exhaust and it was working well for them. He wouldn't do what I want for less than 600 so I just had him run 2.5" from my headers that I put on to a 2.5" converter. Then reduce down to my original exhaust. I know it's not perfect but I will finish with a 2.5 muffler and tailpipe soon.
While it was idling yesterday I pulled of the air filter. It was idling very high. When I removed the filter it went down to a comfortable idle. Could this be timing or fuel/air mix or would an after market air filter work for the new exhaust. Also any suggestions on air filters.
Thanks guys!