Forgot to mention that I sawed off my muffler during my first rear-end install. I cut it off down next to the diff rather than trying to wrestle with it since I was planning to run straight pipes anyway. I'll have a shop weld the pipes out the bumper. Anyone with nice exhaust tips (the physical ones) out there? Would love to see a few pics of some larger tips...somthing to fill the indentation in the bumper. Also, how does one reduce the raspiness?
Man! A 90Q (Jan, 1990 prod date) sounds mean without a muffler when you stomp on it. Even with the bad rear end humming like mad, I couldn't help but grin.
Chopped off the muffler
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craigztoyz
- Posts: 727
- Joined: Fri Jan 18, 2008 3:19 pm
- Car: lots of unique hot rods, and customs, with modern engines, and a good truck to pull the trailer.
Re: Chopped off the muffler (DrewQ45)
Only thing that helps rasp is Resonators, after the cats. You still have the two mufflers before the diff in place? Amazing how much sound deadning they do to these sweet engines. All creating backpressureDrewQ45 wrote:Forgot to mention that I sawed off my muffler during my first rear-end install. I cut it off down next to the diff rather than trying to wrestle with it since I was planning to run straight pipes anyway. I'll have a shop weld the pipes out the bumper. Anyone with nice exhaust tips (the physical ones) out there? Would love to see a few pics of some larger tips...somthing to fill the indentation in the bumper. Also, how does one reduce the raspiness?
Man! A 90Q (Jan, 1990 prod date) sounds mean without a muffler when you stomp on it. Even with the bad rear end humming like mad, I couldn't help but grin.
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konatown
- Posts: 357
- Joined: Tue Aug 22, 2006 10:12 am
- Car: 1994 Infiniti Q45t
2010 Genesis Coupe - Location: Indiana
Re: Chopped off the muffler (DrewQ45)
3" Stainless Steel tips will look like a factory jop
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Chopped off the muffler (konatown)
The stock premufs are already straight thru stainless, look and see.
Actually the entire system doesn't have much back pressure as measured with PSI gauges, why custom catback exhaust only create noise and little torque and much less high rpm HP than one would think.
The farther from exhaust valve you make flow improvements the less they change engine output.
Over the years I had two expensive cat back exhausts both rusted out in 100k, I'm finally back to oem and cannot measure any improvement/loss.
Only the dual in dual out stainless Ultra Flow unit is still functioning on Charlies Q after 9 years.
Actually the entire system doesn't have much back pressure as measured with PSI gauges, why custom catback exhaust only create noise and little torque and much less high rpm HP than one would think.
The farther from exhaust valve you make flow improvements the less they change engine output.
Over the years I had two expensive cat back exhausts both rusted out in 100k, I'm finally back to oem and cannot measure any improvement/loss.
Only the dual in dual out stainless Ultra Flow unit is still functioning on Charlies Q after 9 years.
Re: (qsiguy)
Nice setup, qsiguy. I might copy those tips. I'm just gunna hack off the rear muffler. My exhaust guy will do it very cheap. I've heard youtube vids of stock mufflers and I think resonators are a great idea. Those front mufflers aren't very big, about Flowmaster 40-series sized. The 2" pipes quiet them down quite a bit. Just about the right sound level. I like a nice snarl, but I don't want to wake up the neighborhood unless I'm flooring it.
Re: Chopped off the muffler (DrewQ45)
I did the same thing. Removed the muffler and installed a straight 18" long, 3" dia. Magnaflow stainless steel pipe.