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Naturally Aspirated Performance ForumDiscussion of naturally-aspirated rotary performance. No Power Adders, only pure rotary power!
From the "12A" to the "RENESIS" and beyond.
As an update to this, I've scheduled a couple dyno pulls to test this out. I'm going to do a baseline pull with my current rb true dual exhaust and then swap the exhaust to a friend's spare custom collected set-up.
Custom set up:
This is an RB collected header ->2.5 ID rb presilencer->2.25 ID magnaflow muffler.
The current tune will not be touched and I'll be happy to share my results once done!
I'm a little late joining this chat but, I have about the same question... Right now I'm running the RB tru-dual setup with aero turbine resonators and aero turbine 2540i mufflers on each side. The car is ungodly loud and though it was great at first, I'm ready for something quieter. I want to stay dual but am curious about possibly welding in an x-pipe somewhere. Do the RB pre-silencers ever wear out, or should I replace the pre-silencer with something that collects within itself?
The presilencers are somewhat interesting in that they are not all-muffler but have a kind of terminator box in the front.
Mine are old enough to have rusted through where they were welded to the adjacent pipe but they are still quiet as long as the cracks stay puttied shut
The presilencers are somewhat interesting in that they are not all-muffler but have a kind of terminator box in the front.
Mine are old enough to have rusted through where they were welded to the adjacent pipe but they are still quiet as long as the cracks stay puttied shut
So i guess the question still stands then? Would it be worth it to get a new pre-silencer or cut it out completely and figure out something else? I'm know for a fact I'll be stuffing an x-pipe somewhere!
FYI, my new exhaust (true dual header- Y pipe- Magnaflow presilencer-2.5 inch ID piping- Magna flow straight through single exit muffler) is quieter than my old RB true dual at both idle and low load. At high RPM it's definitely a little louder but not by much.
The x pipe will help quiet the exhaust down because the 2 pulses will somewhat cancel out some noise . To save some room magnaflow makes a dual 2" in and out with a perforated x pipe inside ,tear there crap packing out and fill it with course s.s.wool ( mc master Carr sells it by the pound , one pound is more than enough ) . I did this on my repu with a street port 13b and did a 2" dual inlet to 2 1/2 " single outlet and it worked great
That said, I used to have a 2.5" Magnaflow and a loooong bullet muffler that I repacked. It was NOT quiet. At all. Wasn't OMG ROTARY LOUD but still loud enough to get me pulled over every few months.
My exhaust is very quiet until I get on it. Unless you want stock volume levels, (which is totally fine) an x pipe wouldn't be required. If you're interested, I can get an exhaust video together sometime.
