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Signal 2 · 12-03-2011, 06:05 AM

Why are you convinced you DON'T want a cat? Yes, an open exhaust will allow for more power but as mentioned it can also lead to boost creep by overwhelming your wastegate. And a boost controller will NOT help for creep, only porting the wastegate (requires pulling the turbos) or keeping a cat. A resonated mid-pipe MIGHT help, but I have no experience with them so I'm not sure. They do cost more and I think you want to get one that has a proven record with the higher exhaust temps of a rotary.
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.

And please, enough with the self-flagellation in your posts. It's just wierd. Ask a straight question and I'll (we'll) answer it if we can.

yzf-r1 · 12-04-2011, 12:48 PM

Quote:

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 · 12-04-2011, 03:14 PM

Quote:

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 · 12-05-2011, 11:40 AM

Quote:

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)

12-03-2011, 06:05 AM	#1
Signal 2 Viable Fossil Join Date: Mar 2008 Location: Mid-West Posts: 199 Rep Power: 18	Why are you convinced you DON'T want a cat? Yes, an open exhaust will allow for more power but as mentioned it can also lead to boost creep by overwhelming your wastegate. And a boost controller will NOT help for creep, only porting the wastegate (requires pulling the turbos) or keeping a cat. A resonated mid-pipe MIGHT help, but I have no experience with them so I'm not sure. They do cost more and I think you want to get one that has a proven record with the higher exhaust temps of a rotary. 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. And please, enough with the self-flagellation in your posts. It's just wierd. Ask a straight question and I'll (we'll) answer it if we can. __________________ Jim VR R1 FD Last edited by Signal 2; 12-03-2011 at 06:12 AM.