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#141
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Because our combinations are similar I'm really interested in whether the current mufflers you have are giving you any drone, and also wanted to ask if you are running headers or cast manifolds? My current set up is 455 powered 65 GTO with a comp cams 242/250 solid lift, 2 1/2" from the RA manifolds to the Goerlich 14" Xcelerators and then out to full 2 1/4" tail pipes. The car sounds OK, but the drone is terrible so I was planning to make the switch to the VT's. Do you have a clip of how it currently sounds? |
#142
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Here is my 1974 GTO with a 389, 6x heads, summit 2801 cam, 3 tube junk headers, 3" mandrel bent exhaust into flowmaster 40 series and then to 2-1/2" dumps
https://www.youtube.com/watch?v=RujRTr7btJY Then here is all that with log manifolds, tv7101 turbo, all stainless steel hotside and open 3-1/2" stainless downpipe. This was the first startup and if you listen close you can hear the turbo after the revs https://www.youtube.com/watch?v=hHLo9URR8BI |
#143
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I wish I could still get the mufflers that I had on my car in the 80's. They were Marmont turboflow mufflers, they were made for about 5 years & the sweet sound that came from them was music to the ears. They weren't loud but when you got down on it you knew you were in a Pontiac. It made the engine sound just like the old commercials from the 60's of the GTO's that were on TV. But no more Marmont.
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#144
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Here is a before/after video after replacing the logs and 2" exhaust that came on my 74 TA with 2-1/2" RARE manifolds and a 2-1/2" Pypes crossflow system.
https://youtu.be/RWgYDf8R5j0 455+.060 with 5C-4 heads, 72 factory intake, Q-jet, XE268 cam, TH400, 3.08 posi. Not a race car (yet!) but working on it and its coming along.
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi 1974 455 TA, admiralty blue/red interior HPP "cover car" - sold "The best way to show a car is to drive it" |
#145
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https://www.youtube.com/watch?v=a7wgFwtqGoQ
update, headers installed, rest of system is the same dual with flowmasters. throttle response is now near instant, found out that the old log manifolds had 2" compression bendt downpipes. Nigth and day difference, but speedbumps are now almost impossible to negotiate. |
#146
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Kind of boring but here was when I put my car back together as pure stock 400 HO with a NOS 068 cam , has repop HO manifolds and full length mandrel bent 2.5" pipes with Jegs brand welded style wanna be flowmasters. I liked the sound. https://www.youtube.com/watch?v=OoNrUCkW8AE
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63 Catalina coupe 455 budget drag car 11's 1/4 , 7.4 1/8th 66 Star Chief Executive 57k mile 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd 2019 Chevy Spark petrol car 38 mpg |
#147
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Sorry, I did not notice you had written me and asked me a question. I currently am running the DynoMax polished stainless steel UltraFlow 2 1/2" straight thru mufflers. I have headers into a 2 1/2" exhaust system all the way back. It has no drone and the sound is great. The mufflers were actually originally set up for a 2 1/4" exhaust system and the input and output was expanded to 2 1/2" at the recommendation of the tech at DynoMax to reduce the drone. The internal pipe is actually 2 1/2" so the flow was not affected. The car has been torn apart for almost 5 years for a restoration so I do not have any sound clips with the current setup.
Thanks, Dale Quote:
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#148
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68 tempest 40 over 400 with ram air 4 cam and 3 inch hemi style walker superturbos and turndowns at the axle
https://www.youtube.com/watch?v=Tg7G2axXIDo 70 judge with glasspacks and monza tips https://www.youtube.com/watch?v=Vo-6yR35Pcs |
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