I'm having this same issue about the smoking. After the tune did it stop ? After I put my exhaust on my G it would smoke like that and I could smell fuel/oil being burnt.

 

Check for any vacuum leaks. If the exhaust is new, it's normal to have a burning smell during the beak in period. Did you have symptoms prior to the exhaust change?

 

I bought the exhaust used and no I didn't

 

I used seafoam on my old rsx when it had 100k miles. Got only a little grey smoke coming out of the exhaust. I take that as a sign that I had kept good care of the car. I would never expect to notice a "big" difference after seafoam.... But I know alot of people who stand by it as a maintenance thing to do if you've got a lot of miles on your car.

Someone said to get an oil change afterwards, I didnt know that so good info.

 

at how many miles would you guys recommend using sea foam?

 

depends if those miles included regular oil changes or not. If you take care of your car it wont make a noticeable difference but at the same time cant hurt to do it.

 

I have used sea foam on a couple cars. I def believe in it.

 

Just did it and wow what a difference. Did not know how much power I was losing all this time.