Borla, Pypes, Dynomax/Walker - Chevy Impala SS Forum
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post #1 of 22 (permalink) Old 09-27-2015, 02:17 PM Thread Starter
AP9
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Borla, Pypes, Dynomax/Walker

These are the 3 catback systems I am considering, since the stock exhaust is damaged in a couple places and a bit corroded-looking overall, and I plan on replacing the cats anyway.

I've narrowed it down to these three (actually four I guess, since I will consider Pypes StreetPro and RacePro), but hopefully some of you who have actual experience with them can help me make a final decision. I am looking to keep the vehicle as close to stock as possible in form, fit, and function, but if I happen to gain better fuel economy or power, then great.
  1. Which would be least obnoxious-sounding in partial throttle low-mid RPM?
  2. Which offers the best flow with unmodified engine and headers (I'm guessing not the Borla being 2/2.25")? Anyone happen to have dyno data or fuel economy results?
  3. Which would require the LEAST amount of modification to the vehicle to fit properly?
  4. It wasn't clear to me whether the Dynomax and Pypes systems are completely stainless or partially aluminized steel.

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Flagship and Summer Cruiser:
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Stealth bolt mod, 2.5" X-pipe with Pypes Street Pro mufflers & Dynomax resonators, Weathertech side window deflectors, Hayden 678 "tertiary" transmission cooler & Magnefine inline filter, otherwise completely stock
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post #2 of 22 (permalink) Old 09-27-2015, 02:56 PM
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I have had the Dynomax ultraflo SS 2.5" catback with the bullet resonators and an H-pipe I had the shop make when they installed it for the past 10 years. I have had zero problems and I still like the sound and it is the best flow of the available catbacks. I drive a lot and it doesn't drive me nuts like some louder systems can do. I also live in a rust free environment so that was never a factor.
That being said, the Borla and Pypes are good as well. These days you will probably want an x-pipe but whatever you do, be sure to use an X or H pipe.
Someone with experience with the other systems can comment on them. Good luck.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #3 of 22 (permalink) Old 09-28-2015, 08:26 PM
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Exhaust advice

I have had experience with all the systems you mention. Borla is/was a very popular system for our cars when they were new. The exhaust note is very quiet, however the tips do not look OEM. In my opinion I would pass on this option unless you like the look. It will last forever.

As the other poster states, get yourself an X or H pipe. I recommend an X pipe.

All of the systems will out perform the stock exhaust and improve the sound.

Not to confuse things for you, go to JEG's and check out their house brand exhaust system. It's 2.5 mandrel bends. It does not come with an X pipe, however you can order the X pipe from Pypes and use it. I'm told that the system is actually manufactured by Heart Beat. Both Pypes systems are fairly throaty/loud. If you elect to go that route based on your questions I would recommend the street version.

Having said all that...can't go wrong with a DynoMax system.

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post #4 of 22 (permalink) Old 09-28-2015, 08:36 PM
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IIRC the dynomax system is discontinued but there are still some out there.

I would consider piecing a system together unless you just want bolt on and go.I have the pypes 2.5 mid pipe with an X crossover and I have Walker 2.5 over axle pipes(also discontinued but I managed to find a pair)waiting to be installed once I get headers

.I have several mufflers to choose from and have not decided yet.I have Summit brand stainless mufflers in the stock exhaust and I like the way they sound with the factory resonators.I may buy them in 2.5 or I may run the Dynomax VT mufflers and forgo resonators in the tailpipes.Once I get my headers installed I will make a decision.

The older I get the more I prefer quiet until the hammer is dropped.If I could make my car silent and fast I would.
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post #5 of 22 (permalink) Old 09-28-2015, 10:22 PM Thread Starter
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Thanks all. I am actually now leaning towards piecemealing something together. Would the Pypes XGI10 plus a pair of 2.5" flanges bolt up directly to the catalytic converters? (I have virtually no experience in dealing with exhaust) i.e. replace 45520 and 45521 as in link below?
http://www.rockauto.com/info/9/WAL_13_03076.jpg

Daily Driver and Winter Warrior:
2000 Ford Explorer XLT 4WD (4.0L OHV V6) in Amaȥon Green (SU)

Flagship and Summer Cruiser:
1996 Chevrolet Impala SS in Dark Cherry Metallic (77U/WA9800)
Stealth bolt mod, 2.5" X-pipe with Pypes Street Pro mufflers & Dynomax resonators, Weathertech side window deflectors, Hayden 678 "tertiary" transmission cooler & Magnefine inline filter, otherwise completely stock
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post #6 of 22 (permalink) Old 09-28-2015, 10:58 PM
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Quote:
replace 45520 and 45521
The 45520 and 45521 are not mandrel bent and are stock pipe replacements.


Autozone sells the Dynomax/Walker pipes. The front pipes to the muffler are part numbers 45688 and 45687. They're about $38.00 each. The over the axle pipes are part numbers 54016 and 54017. They're about the same price. The bullet resonators are part numbers 21132 and 21133. Some use them and some folks don't. The pipes are mandrel bent and 2 1/2" diameter. Choose your mufflers and step on the loud pedal. That's about $160 for the 4 pipes.
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post #7 of 22 (permalink) Old 09-29-2015, 12:13 AM
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Quote:
Originally Posted by AP9 View Post
Thanks all. I am actually now leaning towards piecemealing something together. Would the Pypes XGI10 plus a pair of 2.5" flanges bolt up directly to the catalytic converters? (I have virtually no experience in dealing with exhaust) i.e. replace 45520 and 45521 as in link below?
http://www.rockauto.com/info/9/WAL_13_03076.jpg
I did similar years ago with the first pypes x-pipe with walker cat and ota pipes and magnaflow mufflers.
low rumble at idle and literally roars at full throttle.
pretty much bolt in with stainless band clamps.

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post #8 of 22 (permalink) Old 10-13-2015, 08:39 PM Thread Starter
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Thanks all, got sidetracked for awhile with the Explorer and some other stuff.

Are the factory pipes worth anything if still in acceptable condition? I'd hate to have 'em go the scrapper since they're not rusted through or anything. It's just the cats that are just about dead and the resonators/tips that are damaged and rusted.

Daily Driver and Winter Warrior:
2000 Ford Explorer XLT 4WD (4.0L OHV V6) in Amaȥon Green (SU)

Flagship and Summer Cruiser:
1996 Chevrolet Impala SS in Dark Cherry Metallic (77U/WA9800)
Stealth bolt mod, 2.5" X-pipe with Pypes Street Pro mufflers & Dynomax resonators, Weathertech side window deflectors, Hayden 678 "tertiary" transmission cooler & Magnefine inline filter, otherwise completely stock
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post #9 of 22 (permalink) Old 10-16-2015, 08:13 PM
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read my thread on the Dynomax VT mufflers, there is videos showing how silent they are cruising, but snarl when you hammer down!

They are stock quiet on the highway with the cruise set, so the wife appreciates them!

95 Caprice Wagon
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post #10 of 22 (permalink) Old 10-23-2015, 07:18 PM Thread Starter
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Quote:
Originally Posted by Deadman View Post
read my thread on the Dynomax VT mufflers, there is videos showing how silent they are cruising, but snarl when you hammer down!

They are stock quiet on the highway with the cruise set, so the wife appreciates them!

Well, I had ended up getting a Pypes X-pipe, Pypes Street Pro mufflers, Walker 2.5" tailpipes, and Walker resonators. I just got it back from the shop (I have no welding equipment or experience), and the Pypes X-pipe was unusable (poor fit), and I think the system is too loud, especially with an awful drone around 1900 or 2000 rpm. I guess it beats my rattling stock exhaust though. Don't think I'll be buying Pypes anything again.

Maybe in the spring I'll try something else. Those Dynomax VTs sound good based on the videos in that thread, but the idea of a flapper valve doesn't sit too well with me. Are they quieter than the Ultra Flos? Comparable to stock?

Daily Driver and Winter Warrior:
2000 Ford Explorer XLT 4WD (4.0L OHV V6) in Amaȥon Green (SU)

Flagship and Summer Cruiser:
1996 Chevrolet Impala SS in Dark Cherry Metallic (77U/WA9800)
Stealth bolt mod, 2.5" X-pipe with Pypes Street Pro mufflers & Dynomax resonators, Weathertech side window deflectors, Hayden 678 "tertiary" transmission cooler & Magnefine inline filter, otherwise completely stock
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