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#1104074 - 01/13/18 10:24 PM 89 SWB V6 Straight Pipe Exhaust? No Muffler??  
polar  Offline
Need a Spot
Joined: Aug 2007
Posts: 8
Time for a new exhaust system! FYI: I replaced the oem manifolds with the Aussie headers....years ago....to not much if any performance improvement....
I need to replace everything past the headers.... and told the muffler shop I wanted more vroom!...truck exhaust note.

His only suggestion is to run straight pipe, without any muffler. I would have no problem with emission test being its so old and where I'm located....but my question is: does running no muffler change the back pressure and would that cause O2 sensor issues and/or idle or gas mileage problems???

What do the Sages say???


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#1104081 - 01/16/18 12:40 AM Re: 89 SWB V6 Straight Pipe Exhaust? No Muffler?? [Re: polar]  
rxinhed  Offline

Trail Leader
Joined: Feb 2005
Posts: 7,074
Gerber, CA *****
This sage says to use a Dynaflow, MagnaFlow, or equivalent.

Time and again the proponents of no-muffler lose to science. Need the muffler. I have a Montero V6 with a single 24" glasspack and it sounds pretty throaty.


1988 Mighty Max turbo 2.6 service body
1980 Power Wagon W400
Sundry Mitsubishi Montero Gen 1 parts
Parts vehicles: 1980 D50 2wd, 1988 Mighty Max 4wd, 89 LS Montero 4-door, 2002 Sport AWD
For Sale: 1989 Power Ram 50 extended cab

#1104084 - 01/16/18 04:11 AM Re: 89 SWB V6 Straight Pipe Exhaust? No Muffler?? [Re: polar]  
polar  Offline
Need a Spot
Joined: Aug 2007
Posts: 8
Hey RX Thanks for that info. Did you cut your Cat out of the system to get your throaty sound??
I'm thinking of using 2 in and 3 out with Flowmaster Super 40


#1104100 - 01/21/18 12:21 AM Re: 89 SWB V6 Straight Pipe Exhaust? No Muffler?? [Re: polar]  
rxinhed  Offline

Trail Leader
Joined: Feb 2005
Posts: 7,074
Gerber, CA *****
Still has cats

I live in Cali, land of cats


1988 Mighty Max turbo 2.6 service body
1980 Power Wagon W400
Sundry Mitsubishi Montero Gen 1 parts
Parts vehicles: 1980 D50 2wd, 1988 Mighty Max 4wd, 89 LS Montero 4-door, 2002 Sport AWD
For Sale: 1989 Power Ram 50 extended cab


Moderated by  Macka, Mudraider, off-roader, PajEvo, rxinhed 

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