I was just wondering if someone sells a catback that has a 3" y-pipe for my TII or if not does a place sell a high quality y-pipe by itself to include in a custom exhaust system. Thanks.

 

Flowmaster makes nice Y's.

 

Alright I will look for some flowmaster y-pipes, thanks.

 

RB makes the 3"er. Part of there 3" full turbo system.

 

my system was built at mufflerman in surrey

 

Can a muffler shop build a worthy y-pipe? I heard somewhere they can't really build the best y-pipes but I don't know.

 

don't let them build them. his is probably pre made.

 

I couldn't find any Y-pipes on flowmasters website.

 

Any decent exhaust builder can make one. They're just pipe, it's not exactly difficult.Who do you think builds the off-the-shelf ones...

 

Its not 3'' at the Y, is it? I thought it was 2.25 or 2.5.

 

summit has flowmaster y's. 3 inch inlet and and dual 2.25 or 2.5 outlet. ill try and find a part # if youd like.

 

I believe it's 3" in, twin 2¼" out.

 

Is that good enough? I mean do I lose any flow with that or no since its dual?

 

Your best flow would be with a single exhaust.

 

Ya, ya , ya I know that mane, just dual looks 100x better to me. But I should lose any flow by going from one 3" pipe to two 2.25" pipes should I? I think that the APEX N1 is either 2.5" or 2.25" inlet anyways.

 

I do think that's a bit small. My personal preference is twin 2½". Yes you do get a little restriction from turbulence created at the split (more so if it's poorly built), but you also have less restriction in those two pipes because they're only flowing half the exhaust flow each but have 70% the area to flow through compared to a single 3". People constantly argue that a single flows more, but if it's well built and uses the right size pipes and mufflers, there's no reason it won't flow as much or more than a single 3". Plus it will always be quieter and (IHMO) it looks better. Unlike most sports cars, you have the room to fit two huge free-flowing mufflers. Why waste that?

 

I've got to agree with you on the looking better and the possiblilty to flow better with dual. I know I am going to dual and was going to go with the APEX N1 catback but might make my own, just depends. Can't get a definite answer on the pipe sizes on the N1 dual.

 

Any possibility of it looking better goes right in the crapper when you put the N1 duals on it...

 

Thats a matter of opinion.

 

Heheh Yeah.
Sometimes the truth hurts.

The only reason im stuck between dual of single is the extra weight of the dual.

 

Duals are cool I had a single N1 that I sold to Vosko. I wanted the Duals before.

DO NOT GET A FLOWMASTER!!!! the only thing that flows on a flowmaster is the name. Get a straight through Dynomax if your gonna go that route.

You will be happier with a pair of mufflers designed for a rotary. ordinary mufflers sound wierd, some would say like crap, on a rotary. However your local muffler shop should be able to bend you some pipe and make you a system you'll like.

 

There's no such thing as a muffler "designed for a rotary". Exhaust flow is exhaust flow, it all works the same. One muffler will sound different to another one on any engine. The only thing you have to make sure of with mufflers on a rotary is that they're packed with steel wool, not fibreglass.

 

That is basically going from 7 sq in to 8 sq in, which will work out very well IMO, although a 3" DP may be a bit large if that is your plan.

There ARE such things as mufflers NOT designed for a rotary. Flow Masters are one of these brands, although there are many more off-brands that are also not designed for a rotary engine. All exhaust is not the same, as the rotary engine has a much greater exhaust temperature than that of piston engines.

Yes, most likely. Note that some are better than others, pre-made or custom made. You want one with a very small angle between the split, and then you can bend the pipes after the Y if you need more angle. Also note that your exhaust needs to fit under your car, and therefore you will never be able to fabricate it to "perfect world" max-flow standards, so don't worry about it too much.

Good Y (See top right pic):
http://home.tampabay.rr.com/spinraci...ust/index.html

Bad Y (But it works):
http://www.3rotor.com/images/your_ro.../y_exhaust.jpg

Ugly Y:
T-Pipe - fortunately I don't have any pics of this.

Pipe Sources:
http://www.burnsstainless.com/
http://www.twmetals.com/
http://www.aircraftspruce.com/main.html

 

You're right, there are plenty of mufflers that aren't suitable for a rotary, but my comment was regarding exhaust tone (which is all about flow), not temp (that's why I said no fibreglass).

 

OK, but just to clarify for everyone else, it's not just the fiberglass that is the problem. For example, the Flow Master mufflers do not use any packing at all, but rather baffles, which will break their welds under the mighty force of the rotary. We have a very big problem with this in the US because these mufflers are very popular with the piston crowd.

http://www.flowmastermufflers.com/we.../40_Series.jpg