Newfound BALLS for the Bull

Discussion in 'V8 - Performance Upgrades' started by Qshiplvr, Mar 9, 2017.

  1. Qshiplvr

    Qshiplvr SHO Member

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    Yesterday I took the ’99 SHO into the local performance exhaust shop called FMS Performance. I asked the owner, Mike if he could sell me Dynomax Ultraflow mufflers like I had on my ’73 440 Charger Rallye. He said, he’d have to order them, then asked me why I wanted THOSE particular mufflers (this was back in 1997 when I bought them) since their construction was sub-par and straight through design was similar to the much better constructed Magnaflow mufflers (he had a cut out model on display). I agreed that muffler design/construction had come a long way since 1997 and deferred to his experience (considerable) to swap out the stock mufflers and weld in Magnaflow 11235s reattaching the stock tips. Well, when I came back to pick up the car, I couldn’t tell that it had been worked on. The tip positions looked EXACTLY stock. He said: “You’ll like ‘em now!” Yumpin’ Yimminie! He was right! The Magnaflows make it seem like puberty hit the SHO and it went from wheezing Tenor to a nice strong Baritone at full throttle. Now that the car can actually EXHALE, it scoots better too! He said he could give me a little more by going 2.5” pipe all the way back from the third cat. I insisted that I had to be able to pass visual CA nazi smog inspection, and he said that would do it. WOW! I can’t believe it is the same car! All I did was swap out the stock mufflers and it’s like I fell in love all over again! I’m thinking for the extra $200 to do the rest of the piping would be money well spent. The muffler swap cost me $300. Mike is SO experienced; he has a waiting list 2 weeks long to get on his rack. Guess I’m gonna have to go back to the end of the line and wait my turn again.
     
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  2. glockcoma

    glockcoma SHO Member

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    I had flowmasters 40 series on my 97, I got compliments all the time on the sound. I can't count how many times people asked me at a streetlight if I swapped a 5.0 in it lol.
     
  3. Qshiplvr

    Qshiplvr SHO Member

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    Mike, the shop owner said Flowmasters are the number one selling brand of muffler that he sells. I debated (with myself) about the Flowmaster choice, and I likened putting Flowmasters on the SHO with engaging the CAPS LOCK on your keyboard, then ripping it off so that you type IN CAPS ALL THE TIME. I opted for the less loud option so I could hit CAPS LOCK occasionally. It is more stealthy that way. Granted the more I unrestrict the exhaust, the less subtle I will become, so I need to walk a fine line. The Magnaflows are a great start.
     
  4. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    According to some very old posts here and on V8SHO.com, swapping mufflers can add 10 hp to the car (maybe 15 if added to others mods). It's the feeling you have ? Maybe your experienced mechanic gave you an added hp number for this change in exhaust. Do you feel some change in low end torque, some spoke about that ?

    Thanks to share.
     
  5. Qshiplvr

    Qshiplvr SHO Member

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    I have not noticed any low end torque improvement. Since our AX4N transmissions almost feel like a granny gear or towing first gear, it is geared so low, I do not try to launch hard off the line. I usually take it very slow (most times too slow for anyone behind me, which pisses them off), let the transmission shift into second, then really hold the throttle down to drag out 2nd. By the time it shifts at 7,000 rpm, I have an ear-to-ear grin and I am going way over the speed limit on city streets. Since I did not do any dyno measurement to establish a baseline, any guess would be meaningless. All I know is that it is a LOT more fun to drive now, between stops and commute to work. After all, isn't that what enjoying our SHOs is all about?
     
  6. stephen newberg

    stephen newberg Moderator Staff Member

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    There have actually been a number of times that fairly serious people have played with the exhaust and used a dyno, and there really is not much there to be gained. The main advantage of shifting mufflers is to help the sound go to what you personally like, rather than increase HP.

    pax, smn
     
  7. 98SF19

    98SF19 AlphaKennyBuddy

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    I think the FULL TIME CAPS would be running no mufflers at all. There's a video on Youtube of some farm boys doing a burnout in their muff-less Gen 3. It's loud as heck, so be sure to turn your volume down. Sounds very nice on the vid but I've never heard that setup in person. Maybe the Flowmaster analogy would be using a larger monitor with everything proportionally bigger?

    I've always heard that opening up the exhaust gives a slight increase at high end (but robs low end), and inversely, that having an operating IMRC helps down low (when secondaries are closed). Of course, the advantage of the latter is nullified if IMRC does not open secondaries @ 3500. In this case, mashing the gas is tantamount to William Wallace going into into battle, shouting at the top of his lungs, but walking instead of running.
     
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  8. stephen newberg

    stephen newberg Moderator Staff Member

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    I suggest just wiring open the secondaries. This is another thing that a lot of work over the years has been done on, and it seems to be a simple and effective fix that causes no harm. Some people have gone so far as to actually remove the butterflies completely and fill the axle holes. Everything still works the same with them gone.

    pax, smn
     
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  9. 98SF19

    98SF19 AlphaKennyBuddy

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    I think with them gone, you'll get better high end, at the expense of low end (which sucks on the Gen 3 anyway).
    Maybe somebody with them removed can chime in . . .
     
  10. stephen newberg

    stephen newberg Moderator Staff Member

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    No, removing the butterflies, from a lot of testing, does pretty much nothing. Or wiring them open. You can do some looking around for data on this here and on V8SHO.com. The alteration in the torque curve you are mentioning seems to come from opening the exhaust up, but its pretty minor, according to the dyno curves. What you get from the secondaries opening is a sound effect rather than an HP one, though eventually without them open I guess you would starve the motor. The point is, you can just put them open all the time if your IMRC is causing problems and there is no resulting problem or loss.

    pax, smn
     
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