So I installed some Dynomax Ultra Flow Mufflers and there are several things I don't like about them. Hoping to pick y'all's brains to see what my next steps should be.
System Details
- 995 Caprice Wagon. Stock Engine, T56 car (which matters on downshifting per below)
- Factory Manifolds
- Factory Test Pipes (no cats)
- Dynomax 2.5" intermediate Pipes
- Ultra Flow Stainless Direct-fit Mufflers (2.5" in and out, offset)
- Stock Wagon Tail Pipes (2")
- Stock Wagon Resonators in place
The stock tail pipes go into the muffler with a custom adaptor. I made a slip joint with a 2.5" OD, 2"ID split sleeve (304 stainless). The leading edge of the adaptor has a 45 degree chamfer to keep the exhaust gasses from hitting a brick wall. I'm not too concerned about flow, but I eventually want to at least get over the axle with 2.5" pipe. For now I'd like to stick with what I have per above.
What I Don't Like About The Sound
- Too loud at anything over 1/3 throttle
- Inconsistent loudness: It sounds great idling around the driveway and taking off moderately, but goes to ignorant loudness levels without much throttle input.
- The bimodal sound reminds me of a ricer
- I get lots of popping when I downshift (T56 car). Even some loud pops. Sounds kinda silly.
What should I do next?
- I know I need cats. The T56 has delayed their install. Will that make it much quieter? I don't drive the car much, but I know this is the right thing to do. I'm hoping it quiets it down.
- Will an X pipe really help? I am pretty low in this car, and I use a 4" custom driveshaft. It's tight under there. I had hoped to not put in an X-pipe but would consider the Pypes kit. Making a custom crossover is outside of my fabbing skills.
- Should I select a different muffler? This was the only performance off-the-shelf muffler I saw. Maybe try some from other manufacturers? I know the 17749 is popular. I had avoided it due to my lame fabbing skills. Maybe I'll find a way to make this happen.
Any other suggestions? I could use some help getting this dialed in. I'm considering this install a failure at this point.
System Details
- 995 Caprice Wagon. Stock Engine, T56 car (which matters on downshifting per below)
- Factory Manifolds
- Factory Test Pipes (no cats)
- Dynomax 2.5" intermediate Pipes
- Ultra Flow Stainless Direct-fit Mufflers (2.5" in and out, offset)
- Stock Wagon Tail Pipes (2")
- Stock Wagon Resonators in place
The stock tail pipes go into the muffler with a custom adaptor. I made a slip joint with a 2.5" OD, 2"ID split sleeve (304 stainless). The leading edge of the adaptor has a 45 degree chamfer to keep the exhaust gasses from hitting a brick wall. I'm not too concerned about flow, but I eventually want to at least get over the axle with 2.5" pipe. For now I'd like to stick with what I have per above.
What I Don't Like About The Sound
- Too loud at anything over 1/3 throttle
- Inconsistent loudness: It sounds great idling around the driveway and taking off moderately, but goes to ignorant loudness levels without much throttle input.
- The bimodal sound reminds me of a ricer
- I get lots of popping when I downshift (T56 car). Even some loud pops. Sounds kinda silly.
What should I do next?
- I know I need cats. The T56 has delayed their install. Will that make it much quieter? I don't drive the car much, but I know this is the right thing to do. I'm hoping it quiets it down.
- Will an X pipe really help? I am pretty low in this car, and I use a 4" custom driveshaft. It's tight under there. I had hoped to not put in an X-pipe but would consider the Pypes kit. Making a custom crossover is outside of my fabbing skills.
- Should I select a different muffler? This was the only performance off-the-shelf muffler I saw. Maybe try some from other manufacturers? I know the 17749 is popular. I had avoided it due to my lame fabbing skills. Maybe I'll find a way to make this happen.
Any other suggestions? I could use some help getting this dialed in. I'm considering this install a failure at this point.