84 GS hollow Cat?
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#8
Round and Round
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The Bonez pipe is not much louder than stock. Probably adds 10 hp or so. Maybe a little better mileage. Depends on the condition of your cats. If they are clogged the gains will be more significant. Hollowed cat is slightly louder than stock. Straight pipe without some type of resonator or presilencer will be loud.
#10
Round and Round
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I don't know of anyone who sells a ready made straight pipe. If you have one made be sure to use thick walled pipe like RB and Mazdatrix sell. Normal exhaust pipe will not last long on a Rotary. There are two pre cats and the main cat. You probably want to replace all of them with the pipe. That's what the Bonez pipe does. It also uses a resonator. I've never used a straight pipe, but I'd expect it to be pretty loud without some type of resonator in it.
#11
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With a stock exhaust manifold and straight pipe in place of the cats it's not really super loud, but it is quite a bit louder than stock. It makes the stock muffler sound kind of gross, too. Sounds much better with a Racing Beat muffler.
#13
Wankel Me This!!
mine was clogged i took it off and grabbed a stick and rammed all the stuff in it out of it and bolted it back on its louder but all you need is a new muffler to make it sound better.
#16
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i am also considering punching out the cats in my 84 gsl...i would like to open the exhaust up a bit while still having some backpressure to the system. i'm doing this on a budget right now but plan to get a full headerback exhaust made locally once i have the cash
heres what the plan is far....i would like to hollow out the two pre cats and the primary cat rather putting straight piping in (keeping the exhaust looking stock), then i plan on cutting the stock rusted muffler off and adding either a generic fart can or cheep-o turbo muffler for some sound trials (currently i have one fart can, one super 40 flowmaster, and one dynomaxx that i will try and pick the best sounding) WILL POST VID'S AND SOUND CLIPS
i know that whatever muffler i use will most likely be destroyed soon from the heat....i'm cool with that seeing as i have random used mufflers laying around
i am going to use as much of the stock system as i can right now because i am on budget, is there any resinators or pre mufflers i can eliminate while doing this?
i wish do do this all in one day, so i was wondering how much of a fight it will be to get the whole exhaust system out of the car (with exeption of the manifold)?
any tips on gutting the cats? do all three just unbolt from the system or are they welded onto the pipe?
JUST FYI....i dont have any emmissions i need to pass or restrictions on noise since the car is registered in the middle of BFE :P
heres what the plan is far....i would like to hollow out the two pre cats and the primary cat rather putting straight piping in (keeping the exhaust looking stock), then i plan on cutting the stock rusted muffler off and adding either a generic fart can or cheep-o turbo muffler for some sound trials (currently i have one fart can, one super 40 flowmaster, and one dynomaxx that i will try and pick the best sounding) WILL POST VID'S AND SOUND CLIPS
i know that whatever muffler i use will most likely be destroyed soon from the heat....i'm cool with that seeing as i have random used mufflers laying around
i am going to use as much of the stock system as i can right now because i am on budget, is there any resinators or pre mufflers i can eliminate while doing this?
i wish do do this all in one day, so i was wondering how much of a fight it will be to get the whole exhaust system out of the car (with exeption of the manifold)?
any tips on gutting the cats? do all three just unbolt from the system or are they welded onto the pipe?
JUST FYI....i dont have any emmissions i need to pass or restrictions on noise since the car is registered in the middle of BFE :P
#17
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Don't bother with the Flowmaster. It's been done many times before and it's never once sounded any good.
The cats unbolt from the rest of the exhaust, but you may need heat and PB Blaster or the like to loosen them up if they've never been removed.
The cats unbolt from the rest of the exhaust, but you may need heat and PB Blaster or the like to loosen them up if they've never been removed.
#18
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And there is no reason to attempt to retain any backpressure in the system. That may apply to piston engines, but rotaries just want to BREATHE...
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#20
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I switched to the Racing Beat system, from header to tailpipe. Nice mellow sound at low speeds, more aggressive when you get on the throttle. There's a reason Mazda went to racing Beat to tune some of their models
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