Timdevlin

Thanks guys. I appreciate your help. I don't know where I read the 2.5" I will reduce and put the appropriately sized muffler. I am sure there is a vacuum line issue because of the covering of the exhaust manifold that I removed to put the 4 into 1 on.

thanks Jdemarris I wish I would have found this Forum earlier. I read one Forum that said it would help. I know that is not enough to go on. However I had a leak in my exhaust manifold. Now I have a 4 into 1 header going to 2.5" pipes. Then that goes to a 2.5" converter. then nothing. How would you suggest to finish the system. I am going to replace the stock air filter first and see if that helps with the airflow issue. Again, that could be timing. It is shuttering when I shut it off after running. I have a lot to learn I appreciate your time and suggestions.

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!