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[yzf-r1]

Originally Posted by Signal 2

Keeping a cat, preferably a hi-flow cat, has other advantages too. It helps quiet the car to a level where a stereo is functional. It also keeps the fumes from making your eyes water and smelling like a monkey's ass at high-noon.

I've been running a resonated midpipe for a very long time and I don't really notice the vapor/fumes all that much, perhaps I'm just used to it

[Signal 2]

Originally Posted by yzf-r1

I've been running a resonated midpipe for a very long time and I don't really notice the vapor/fumes all that much, perhaps I'm just used to it

OK, as I said, I don't have experience with them.
I do know a friend's single turbo frequently tracked car with a mid-pipe makes a god-awful stench. I make a point not to follow him in traffic. And as a former smoker (now just the occasional cigar) I'm not all that sensitive, but his exhaust really does make my eyes water.
Tuning has something to do with the smell I suppose, but his car is really LOUD too. Fortunately the Harley riders took the heat off of cars like his on that issue.

[Fendamonky]

Originally Posted by Signal 2

OK, as I said, I don't have experience with them.
I do know a friend's single turbo frequently tracked car with a mid-pipe makes a god-awful stench.

I think that has a LOT to do with the tune and his cruising AFRs. After getting a tune from Enzo my idle and cruising AFRs were pretty damned rich, I couldn't stay in one spot in my garage for more than 30 seconds before my eyes would start to burn.

After getting it retuned, and having more acceptable AFRs/almost 100 extra whp, I barely noticed the horrible amounts of unburnt fuel in the air. This was with me running a straight (4") exhaust, zero cats and just two mufflers. (Yeah, it's loud as hell now! lol)