S4/GT small resonators on an 86.5
11-25-2008, 11:17 PM
#1
Inventor
Rennlist Member
Rennlist Member
Thread Starter
S4/GT small resonators on an 86.5
In place of the big mombos (AKA GTS resonators).
Surpisingly, it is not really much louder, just a bit more growly when floored. I was hoping/fearing a big increase in sound, but nooooo. It's quite a bit lighter in weight, though! (In a way, it might be quieter, because I used to hear rumbling inside the big resonators at low speeds, but that is gone now.)
The right side fits up to the pumkin exactly. The left side outlet pipe is longer, and farther out, and has to be modified.
Cut the resonator outlet through the second weld line. After grinding the rest of the weld away, the remainder of the outlet pipe can be pulled out. Slide the pipe back into the resonator about 1" and install to see how much it needs to be shortened. 1-7/8" cut out, and the tip rotated ~1/8" downward, and it lined right up. Took it off, and tack welded all the way around with stainless steel MIG wire, and it was done!
I was in a hurry to get somewhere, so it was done 'in about an hour'.
HeX-pipe with bypass valve, 'GT' mufflers, de-baffled rear muffler (RMBMat).
Surpisingly, it is not really much louder, just a bit more growly when floored. I was hoping/fearing a big increase in sound, but nooooo. It's quite a bit lighter in weight, though! (In a way, it might be quieter, because I used to hear rumbling inside the big resonators at low speeds, but that is gone now.)
The right side fits up to the pumkin exactly. The left side outlet pipe is longer, and farther out, and has to be modified.
Cut the resonator outlet through the second weld line. After grinding the rest of the weld away, the remainder of the outlet pipe can be pulled out. Slide the pipe back into the resonator about 1" and install to see how much it needs to be shortened. 1-7/8" cut out, and the tip rotated ~1/8" downward, and it lined right up. Took it off, and tack welded all the way around with stainless steel MIG wire, and it was done!
I was in a hurry to get somewhere, so it was done 'in about an hour'.
HeX-pipe with bypass valve, 'GT' mufflers, de-baffled rear muffler (RMBMat).
Last edited by PorKen; 11-26-2008 at 02:02 PM.
11-25-2008, 11:26 PM
#2
Rennlist Member
Try a RMB?
My car with stock 'smaller' resonators and with the X and RMB.............LOUD!!!
Tried the OEM rear muffler; too quiet..............GT rear muffler; perfect IMHO.
My car with stock 'smaller' resonators and with the X and RMB.............LOUD!!!
Tried the OEM rear muffler; too quiet..............GT rear muffler; perfect IMHO.
11-25-2008, 11:46 PM
#3
Team Owner
Ken thats a clean underbody, nice work on the exhaust....
11-26-2008, 12:46 AM
#4
What am I missing here?
Big resonators vs GT/small resonators?
I've tried to find out (small real world sample) on what '87+'s have the smaller vs the larger resonators and it seems to be a mix with no sequence on what year got the smaller/larger resonators.
Got the smaller on both my '88 and the '90, but have seen many around here that have larger resonators............there is no pattern.
Or did I miss the entire purpose of this thread? Could be that...........sorry
Big resonators vs GT/small resonators?
I've tried to find out (small real world sample) on what '87+'s have the smaller vs the larger resonators and it seems to be a mix with no sequence on what year got the smaller/larger resonators.
Got the smaller on both my '88 and the '90, but have seen many around here that have larger resonators............there is no pattern.
Or did I miss the entire purpose of this thread? Could be that...........sorry
11-26-2008, 03:55 AM
#5
Nordschleife Master
I think that Ken is bored again 
playing more with the exhaust Ken,
We need to get you to install an aftermarket EFI setup in the car, that should keep you busy for a month, Though I dont know if Louie wants that much company
playing more with the exhaust Ken,
We need to get you to install an aftermarket EFI setup in the car, that should keep you busy for a month, Though I dont know if Louie wants that much company
11-26-2008, 01:32 PM
#6
Inventor
Rennlist Member
Rennlist Member
Thread Starter
Hey! I've been meaning to do this for a long time, but didn't get the exhaust until a few days ago. Anyway, I'm just showing how to adapt the later exhausts to the otherwise superior '86.5.
Just by looking at them, I think the mombos might actually flow better. The smaller resonator has a nasty 80ish° turn into it, whereas the big ones have a smooth curve through the body.
Just by looking at them, I think the mombos might actually flow better. The smaller resonator has a nasty 80ish° turn into it, whereas the big ones have a smooth curve through the body.
11-26-2008, 02:14 PM
#7
Nordschleife Master
Ken, you could ver easily take that 80 deg bend out of them, just a couple simple cuts and welds!
Why are you in front of the computer! (why am I in front of the computer!)
Why are you in front of the computer! (why am I in front of the computer!)
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11-26-2008, 06:44 PM
#9
Race Car
Hey! I've been meaning to do this for a long time, but didn't get the exhaust until a few days ago. Anyway, I'm just showing how to adapt the later exhausts to the otherwise superior '86.5.
Just by looking at them, I think the mombos might actually flow better. The smaller resonator has a nasty 80ish° turn into it, whereas the big ones have a smooth curve through the body.
Just by looking at them, I think the mombos might actually flow better. The smaller resonator has a nasty 80ish° turn into it, whereas the big ones have a smooth curve through the body.
