Drewster67

Looking for a RMB for my 84. Anyone know of any?

TIA

Scott M.

Drew;

None are commercially made for the pre 86.5 cars. Best bet is to take it to a quality muffler shop and have them whack off the rear muffler and weld on a straight pipe.

Or, go w/ a true dual exhaust (like the 85 + cars) and enjoy about a 22 rwhp gain.

Check out James Komiaks rennlist page for hp gains w/ different exhaust mods.

Scott

Rufus Sanders

Having done this mod and then un-done it, I can tell you that I found a real lack of low end torque with an RMB on my '82. I ran it that way all last summer and the first thing I did this spring was put a muffler back on.

Wow what an improvement. I know it goes against current thinking, but I truly feel that Porsche got the exhaust right on the pre 87s. But it is easy to do as mentioned above, ant it only cost me 40 bucks to put the muffler back on. - Ruf

drnick

drew,

is your 84 a euro with twin pipes throughout? if so then the RMB is same as 86.5 USA. i got mine from 929 intl in polished stainless and it is a quality item.

Drewster67

Yes - my exhaust is twin pipe all the way back. (From the headers)


I'm thinking about running this magnaflow with One three pipe from the resonator.

Using a two into one collector from the resonator - then running a 3" pipe to this muffler, which would hang in the same local as the original muffler.

Thats what I was thinking for a RMB.

drnick

im not sure i got that but it sounds like you are going to a single pipe system? im curious to know what the deal is on the ott x-over and why people install it.

SharkSkin

Having a crossover increases torque. My 1967 Dodge R/T had a factory crossover tube just between the tranny pan and the bellhousing. A friend that was restoring the same model but with PO-hacked exhaust copied mine and picked up ~1/3 sec in the 1/4 mile. Others have studied the science and can better explain, but the bottom line is performance. Oh, and it improves the sound too.

hacker-pschorr

Oh c'mon, you knew I would argue this!

I have the rear and secondary muffler off the '81. Nothing but pipe after the CAT.

Sound? Awesome, I know two other people that have MSDS headers and custom exhaust that have told me mine sounds better.

Ever see bullitt? The end of the chase scene where Steve is putting his 8-speed mustang throught he gears down the highway? I've been told my car sounds like that when I shift.

Power? Rufus is probably right, but my engine was in such sorry shape when I did this, I can't say it mattered. The SC will take care of that.

Drewster67

Just from the resonator back. I fear that if I bypass the resonator it WILL be too loud. The 3" single pipe, from the resonator back, is for simplicity plus the magnaflow has a single 3" inlet.

drnick

ok drew, so the front part of the exhaust will stay stock up to the first (central) resonator and then you will have one pipe after that with the magnaflow end can.

hmmm... might be good!

Drewster67

Yep - thats the ticket. Once it's all said and done I will be posting before and after audio clips. I'm anxious as all can be to hear the final results.

hacker-pschorr

Take'em both off, trust me.

At 80mph with the windows down, I cannot hear my exhaust at all.

Drewster67

Hacker- Pschorr

How about an audio clip?

hacker-pschorr

Drewster67, I plan to once the engine is back together. Should be middle of next week I plan to use a friends digital recorder and try to get some audio.

Drewster67

Cool Cool