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Single muffler 3 inch catback system


PLTek

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Hello,

 

We are at the final stages of pre-production for a FLOW single round tip muffler (left side) catback exhaust.

 

It will be 3 inches all the way back from the donut gasket, with 12 inch resonator, and a 4.5 inch round double-walled tip.

 

We will also sell a full TBE system either with or without high-flow cat on a full 3 inch downpipe or with a FLOW shorty downpipe.

 

Wanted to find out who would be interested. If so, I might organize a group buy and save everyone a few bucks and or add something free like Urethane exhaust hangers.

 

Best Regards,

 

Peter Sz

PLtek,llc

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hi,

 

its all stainless.

 

I will post some pics by tuesday. It actually looks pretty good without the filler on the right side, maybe someone can come up with a filler. (:

 

In terms of left v. right, decided to follow its sister Impreza, also did not wanto copy the EVO that breaths out the right side (:

 

Pricing coming up as well.

 

Best

 

PS

PLTek,llc

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With my testing I have found the single tip is the optimal exhaust setup for the biggest performance gain for your lgt. A turbo car has no need for a y-pipe and the dual-tipped exhaust setups "fork" in the exhaust stream is a significant bottle-neck, expecially when reducing to 2.25" pipe/mufflers. As stated, Less backpressure equals more high rpm horsepower. It doesn't necessarily mean louder as this is a function that is detemined by the muffler itself.

2012 Forester XT. Stage 2+

Retired from Racing. I used to build FMIC and more.

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Pardon my rudimentary Physics knowledge, but 2 x 2.25" pipes has a larger cross-sectional area (31.8 sq. in.) than 1 x 3" (28.3 sq. in.), and I thought that was what mattered. So if tests show that 1 x 3" exhaust gives better performance, then it must be the shape of the Y-neck that's the problem. (Just spouting some Fermi-isms).

 

At any rate, if performance is indeed better and sound levels <= stock, I'm definitely interested.

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I personally like the look of dual mufflers myself, but in my situation performance > looks of rear. :)

 

In regards to flow, the two 2.25 will flow, but your talking about a 2.5 or 3 to 2.25 y reduction. that is your bottleneck. expecially with backpressure buildup. A cutout before cats, or the y alieviates all this.

2012 Forester XT. Stage 2+

Retired from Racing. I used to build FMIC and more.

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This exhaust will flow a lot better than the stock. You have a full 3 inch pipe from the graphite donut to the muffler. The bends are a lot less aggressive and the muffler is high flowing.

 

In terms of a plug, it can be made from a sheet of aluminum and then painted black. I will experiment with some solution but with many handy and creative LGT owners out there, I am sure that the best, cheapest, optimal solution can be developed.

 

Thank you for your interested and more information to come this week.

 

Best Regards

 

Peter Sz

PLTek,llc

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Slightly related, but does the tip configuration affect performance or sound in any way? I notice that some tips have extra enclosures on them (like a cylinder within a cylinder). Some are just pipes cut at an angle.

 

I'm interested in a low-profile car which is why the 1-tip exhaust sounds attractive, but if there's going to be a canon-like muzzle sticking out of my rear ... :(

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I personally like the look of dual mufflers myself, but in my situation performance > looks of rear. :)

 

In regards to flow, the two 2.25 will flow, but your talking about a 2.5 or 3 to 2.25 y reduction. that is your bottleneck. expecially with backpressure buildup. A cutout before cats, or the y alieviates all this.

 

 

this is what I don't get: you are talking about a 3" or 2.5 mid to 2 x 2.25 (or if stock, 2 x. 1.75 or whatever the stock pipe is).

 

this isn't a reduction at all. the volume of the pipes after the Y is actually greater than before. until someone proves otherwise, I see no advantage to going with a single pipe, or, for that matter, even replacing the stock Y pipe.

getting out of the legacy game :cool:
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the y is it's still a restriction in flow and if it's not a perfect weld, even more of a restriction.

 

Advantages of a single exit exhaust are more top end horsepower. How else do you explain my ET in the 1/4. I am the only LGT that I know of with a single exit exhaust on that 1/4 times list, and after taking the muffler off last week, I gained another mph over that time. If I had a clutch that'd hold I'd most likely be in the 12's with a stock turbo'd legacy. I've done no magic or weight reduction, just removed restrictions holding back the power of the boxer 2.5 and uped it's boost to 1.2 bar.

 

Is a 2.5" downpipe going to be a restriction, yes.

Is a 3.0" dp -> 2.5" exhaust going to restrict, yes.

Is a 3.0" pipe, all the way back less of a restriction that 3.0" pipe hitting a y pipe?, yes.

 

It really is your choice, and I'm not trying to sell this setup, but just stating that the optimal flow comes from an exhaust with no flow restrictions, and I have seen it proven. I'm convinced.

 

Take care,

Rob

2012 Forester XT. Stage 2+

Retired from Racing. I used to build FMIC and more.

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