rustfarmer Posted March 6, 2016 Share Posted March 6, 2016 New to me 89 Forester has no converters, but has one bung welded in with one O2 sensor and runs great. I will try to scrounge a whole stock system, but what I really want is a way to dual out the exhaust to free things up a bit and still use cats to be Mr. Green, and have no CEL on. Hate to have to use aftermarket dual cats due to $, so what's the best fix? Link to comment Share on other sites More sharing options...
DaveT Posted March 6, 2016 Share Posted March 6, 2016 this is confusing. There were no foresters in 1989. The ECUs in 89 had no way to know if you have cats or not. Link to comment Share on other sites More sharing options...
maozebong Posted March 6, 2016 Share Posted March 6, 2016 Dual exhaust loses scavenging abilities on a 4 cylinder. Expect notable losses. Link to comment Share on other sites More sharing options...
rustfarmer Posted March 6, 2016 Author Share Posted March 6, 2016 Sorry for typo--My Forester is a 1998, not 89. I am going to boneyard today hoping to get entire stock exhaust. So maozebong freeing up exhaust flow by using headers, free flow cats and better mufflers, coupled with intake improvements will not help fuel mileage? I thought easy in--easy out usually is a good thing. Link to comment Share on other sites More sharing options...
DaveT Posted March 6, 2016 Share Posted March 6, 2016 The un even pulses in the exhaust in these engines doesn't help to go dual all the way. You can go up a pipe size or 2. For EA82 engines, this makes a very small difference due to other limitatons. For a 98 forester, you really want to be in the newer generation sub forum. There are a lot of differences between anything before 94 and after. Link to comment Share on other sites More sharing options...
rustfarmer Posted March 6, 2016 Author Share Posted March 6, 2016 You are right about posting in the wrong section. Sorry, must have been having a brain fart. Link to comment Share on other sites More sharing options...
idosubaru Posted March 7, 2016 Share Posted March 7, 2016 That engine is rather optimized, and it's NA any gains will be negligible at best. That's not a reason to avoid doing it of course. Link to comment Share on other sites More sharing options...
idosubaru Posted March 7, 2016 Share Posted March 7, 2016 That engine is rather optimized, and it's NA any gains will be negligible at best. That's not a reason to avoid doing it of course. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now