S&S just released their new 2-1 exhaust system this month.

They have two versions apparently - one with a cat and one without. Interestingly enough, the dyno chart they posted shows the one with that cat actually performing better than the cat-less one.

This looks like a great alternative to the more expensive D&D Billet Cat and the curve of the Sidewinder doesn't have such an extreme bend to it (which I think makes it look better).

Anyone have any opinions? Are all 2-1's virtually the same as far as performance is concerned? Will there be a noticeable difference (performance-wise) if I swap out the Street Cannons I just bought for this?

Cat (Chrome)
https://www.sscycle.com/products/sid...dels-49-state/

Cat-less (Chrome)
https://www.sscycle.com/products/sid...-m8-fl-models/

 

To me the cat pipe looks like it has some reversion around 2200 , I thought it might be the other way around ??
Could be tuning , someone with more knowledge than I will know.

 

S&S don't say if they tuned it or just swopped the bits ...if it was me I'd go for the one I like the look of.

 

Yeah, I agree with what Steve says - my question was more along the lines of are all 2-1’s roughly the same performance-wise? I’m not claiming S&S’ test numbers are accurate, but I do believe that a 2-1 system has got to be better than most other systems and (hopefully) not suffer from low-end torque loss.

 

So some say. There are those that suggest that a good 2-1-2 is just as good tho.

When I bought mine I had come to the conclusion there were more fan boys and marketing than actual real performance differences. Sound on the other hand seems to vary a lot. The disc system on the Supertrap are supposed to be "turnable" but look fugly to me personally.

I ended up going back to the stock header with non cat slip-ons because it I thought it "felt" better down low. Without any real back to back testing you will end up with 1001 opinions.

 

although I can't see what testing he was referring to and to be a little critical (sorry) I'm not sure what a dump off is other than a 2-1-2 rather than a 2-1-1

Jamies recent testing was with his 2-1-2 ...maybe he'll try his 2-1 for a comparison

 

I know Darren (Durwood) over at Sheffer Performance did several tests with the Billet Cat. All of which looked impressive. I would’ve gotten the Billet Cat if not for the expense of it and because I hated the look of the shape of the rear pipe.

 

Jamie has already tested their 2-1 with the 222 cam & it showed a significant left side increase, keep up with the game. There are more tests than just on this forum,all have shown better low end tq with a 2-1. All you have to do is look at the design of the stock header, the left side just has a 1.75 inch pipe welded in at a 90* angle, very bad for flow. The right side is a 2.5 inch outlet into that muffler, guess which one is going to flow more? The left side, even at idle, is flowing substantially less than the right muffler. The left muffler is just a glorified ghost pipe that will see very little flow at upper RPMs. There are several single slip on mufflers that just cap off the left side outlet to make a low cost 2-1 with the stock headpipe, Khrome Werks has one they call The Torque Booster. Although I haven't seen any charts I've used their products & they perform as claimed. The ratio between intake port flow to exhaust port flow is greater than the TCs, the exhaust flow is a much less, making the exhaust much more critical to try to even out the flow.

 

Based on that, and some other research obviously, I think I am going to return the Street Cannons and order the Sidewinder. So far it’s the only 2-1 I’ve found that I like the looks of.

 

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Agreed, I wasn't keeping up and the chart is there for folks to draw their own conclusions