Since the last system was such a failure due to NOISE! I am in the process of building a new single exhaust for the NA.
Current thinking has me leaning towards: RB Road Race Header 2" to 2 1/2" Collector RB Pre-Silencer -or- Borla X1R 2 1/2 pipe w/Mandrel bends to RB Turbo Muffler. I am also open to suggestions. Trying to keep costs and noise at a minumum. I was banned from running the last AUTO-X due to Excessive noise. I have also considered a Supertrapp Silenecer on the pipe so I can remove baffles when I need to tone it down for Sports Car Communist of America Events. JOhn |
What are your goals? Not that I have any suggestions, I'm just curious. Are you going for acceptable noise, good power, with something inexpensive?
I guess my question is, why are you doing this, as opposed to one of the systems currently on the market? (besides "making stuff is fun") |
well if you want quiet go true duals with one "turbo" muffler and the longest glasspack you can fit on eash pipe. each pipe should be 2-2.5" diameter. it will lack high end hp due to it not being collected, but its quiet cause its mostly muffler
mike |
I don't neccesarily want "QUIET". I want it to be less obnoxious to prevent me from getting banned at the AUTO-X. See my post here:https://www.nopistons.com/forums/ind...howtopic=26252 https://www.nopistons.com/forums/pub...1047683358.gif
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Wow, SCCA said your car was too loud? They haven't been to OUR meets then! Holy **** do we have some loud cars (like a Lotus Super 7 with a Chevy 3800 motor bored over running open headers, and Vosko's old GTU running a straight pipe after headers), and they have never said anything about excessive noise...maaybe your region is just a bunch of commies https://www.nopistons.com/forums/pub...#>/biggrin.png
Anyway, your setup sounds pretty good...maybe go with a non-turbo muffler though, for the slightly smaller diameter. |
I don't call them th SPORTS CAR COMMUNISTS of AMERICA for nothing!
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That's ridiculous.. I've heard open header cars at our events too.
Here's what I think you should do Banzai. Stay away from supertrapps or any louver core or turbo mufflers, they don't flow enough. Just stick with perf core resonator/presilencer and a straight through muff. Go with the RB road race header, collector to single RB presilencer to Magnaflow stainless straight through muff ($70 at bigexhaust.com, pick your size). Or go true duals with 2 presilencers and 2 straight through muffs. |
my engine is ported like yours and I'm running RB streetable header with the RB presilencer and the RB duals, it's too quiet, the intake is louder than the exhaust.
I think you might do well wit hthe single RB turbo muffler, I'm not sure how much silencing the presilencer does. |
Well for RIGHT now, I took off the FLOWMASTER and went to 2 1/2" after the Spin-Tech to a Magnaflow Part # 14326.
http://www.magnaflow.com/02product/ss.htm I can actually hear myself think at idle. Dyno will tell the storey next Tuesday |
You can add a downturn at the end to direct noise at the ground.
It works on tracks where the db meter is at a fixed location. May not work to well if they walk up to the car. |
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