exhaust help

lcrotaryracer · 02-18-2009, 09:37 PM

how loud will it be if i take off the cat on my 87 na. I have brola mufflers and a header duel in single out. its not loud now but would it be make it unbearable.

Max777 · 02-18-2009, 10:51 PM

if you would like to take out the cat, and do not want to have an overly loud car, you can get a "presilencer" from racing beat, which is specifically engineered to muffle a rotary engine.

Nopis1O · 02-18-2009, 11:31 PM

its going to make it a bit louder but not that much. i think you would be happy with it.

TehMonkay · 02-18-2009, 11:44 PM

It depends on your taste and if you drive the car on the highway long distances.

lcrotaryracer · 02-18-2009, 11:56 PM

the loud part is ok. would it sound ok or like weed eater.

Ender · 02-19-2009, 08:42 AM

I think it'll hum more than buzz, but the rotary emanates smooth vibes. You'll probably be fine. I'd take the suggestion of installing a Racing Beat presilencer, it's like a glass pack I believe, but will withstand the higher exhaust temps the rotary produces and should give you a nice tone. A standard glass pack will quickly melt out on a rotary, one reason they're known as thermal reactors...

My5ABaby · 02-19-2009, 08:57 AM

Quote:

Originally Posted by lcrotaryracer

how loud will it be if i take off the cat on my 87 na. I have brola mufflers and a header duel in single out. its not loud now but would it be make it unbearable.

I have the stock system except for a straight pipe where the cats are. It's my understanding that both the Borla mufflers and header will make your car louder than my stock mufflers and stock manifold. As it is now, I feel it's bearable, but for any sort of extended drive (i.e. highway) it gets to be a bit much. However, I don't have a radio so there is no drowning out of the exhaust.

TehMonkay · 02-19-2009, 11:28 AM

With borla mufflers it shouldnt sound like shit.

JunpoweR · 02-20-2009, 06:12 AM

I have gutted stock Cats before and it was just fine =)
Pretty loud and throaty on idle but the car was much faster!

NoDOHC · 02-28-2009, 11:50 PM

I ran Racing beat headers through a straight pipe to dual Dynaflow (piston engine-straight through) mufflers on my '86 when it was N/A and the clutch fan was still louder than the exhaust. My '91 is WAY louder than the '86 ever was with full racing beat exhaust except for the stock catalytic converter between headers and y-pipe (I am sure that a lot of that is the useless slush box between my eccentric shaft and drive shaft).

Phoenix7 · 03-01-2009, 01:41 AM

Open piped NA is retarded loud. I loved the sound of it for 10 minutes before I wanted to blow my brains all over the interstate.

need RX7 · 03-01-2009, 02:02 AM

Quote:

Originally Posted by Phoenix7

Open piped NA is retarded loud. I loved the sound of it for 10 minutes before I wanted to blow my brains all over the interstate.

Yeah, when I was running my n/a open manifold, You had to stand at the end of the driveway and yell at someone to carry on a conversation while the car idled in the garage. Doesn't help that the idle was 11-1200 rpm at the time

. It scared the hell out of my cat too, whenever I shut it down, she would come up from the basement and look around like "Did the world end?"

Phoenix7 · 03-01-2009, 02:15 AM

We did the same thing....turned it on with headers only......my ears were ringing for a while.

Max777 · 03-01-2009, 03:03 PM

shit, I did that... it wasnt to bad... We have a dirt track sportsman racecar at school, it runs like 4" exhaust with no mufflers.... now THAT car is loud!

Phoenix7 · 03-01-2009, 03:42 PM

Dunno man, I've heard open piped v8s and it didn't hurt as much as an NA.

02-18-2009, 09:37 PM	#1
lcrotaryracer Rotary Fan in Training Join Date: Oct 2008 Location: lenoir city, TN Posts: 63 Rep Power: 17	exhaust help how loud will it be if i take off the cat on my 87 na. I have brola mufflers and a header duel in single out. its not loud now but would it be make it unbearable. __________________ you can always have fun in a rx7

02-18-2009, 10:51 PM	#2
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 18	if you would like to take out the cat, and do not want to have an overly loud car, you can get a "presilencer" from racing beat, which is specifically engineered to muffle a rotary engine. __________________ Rotaries:They are NOT that complicated! Last edited by Max777; 02-18-2009 at 10:54 PM.

02-18-2009, 11:31 PM	#3
Nopis1O Rotary Fanatic Join Date: Apr 2008 Location: Mid State Illinois Posts: 159 Rep Power: 17	its going to make it a bit louder but not that much. i think you would be happy with it. __________________ 1988 Fc Vert. Super Stock 1990 Fc Hard top: Brideported 13b, weber carb, 350z wheels w/nitrogen, or 16in BBS meshies, Msd, Racaro Racing Seats, Custom Gauge cluster, custom Intake, Relocated Battery, 3inch header back borla exhaust system, Alpine stereo system, Wire tucked, S4 shift boot&knob, custom Strut bar, And soon to come a Full black w/ gold pearl paint job, powder coated break calipers, all black interior, bride headliner/door panels.

02-18-2009, 11:44 PM	#4
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY Posts: 302 Rep Power: 17	It depends on your taste and if you drive the car on the highway long distances. __________________ My car blows up everytime I start it, it's rotary

02-18-2009, 11:56 PM	#5
lcrotaryracer Rotary Fan in Training Join Date: Oct 2008 Location: lenoir city, TN Posts: 63 Rep Power: 17	the loud part is ok. would it sound ok or like weed eater. __________________ you can always have fun in a rx7

02-19-2009, 11:28 AM	#8
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY Posts: 302 Rep Power: 17	With borla mufflers it shouldnt sound like shit. __________________ My car blows up everytime I start it, it's rotary

02-20-2009, 06:12 AM	#9
JunpoweR Rotary Fan in Training Join Date: May 2008 Posts: 66 Rep Power: 0	I have gutted stock Cats before and it was just fine =) Pretty loud and throaty on idle but the car was much faster! __________________ --^v--JunpoweR--^v-- "90 GTUs Crystal White GT35 WB TA Project "90 GTUs Brilliant Black Restoration 1984 GSL-SE Daily

02-28-2009, 11:50 PM	#10
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I ran Racing beat headers through a straight pipe to dual Dynaflow (piston engine-straight through) mufflers on my '86 when it was N/A and the clutch fan was still louder than the exhaust. My '91 is WAY louder than the '86 ever was with full racing beat exhaust except for the stock catalytic converter between headers and y-pipe (I am sure that a lot of that is the useless slush box between my eccentric shaft and drive shaft). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

03-01-2009, 03:03 PM	#14
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 18	shit, I did that... it wasnt to bad... We have a dirt track sportsman racecar at school, it runs like 4" exhaust with no mufflers.... now THAT car is loud! __________________ Rotaries:They are NOT that complicated!