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Hey Guys,

So Part of my future build, I am looking at MMR lightweight pulleys for my GT350. I don't have mine to look at right now, but does it have a 3 bolt or 4 bolt pattern. The guy I spoke with, says 4 bolt. Can anyone confirm this for me? :confused:
 

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Hey Das, just looking at the MMR site it looks as if we need the 4 bolt (says will fit the GT350 as well):

Fits Mustang 5.0 2011-2017
3-Bolt: 2011-Mid Year 2014
4-Bolt: Mid Year 2014-2017
 

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Curious, anyone doing these pulleys and if so, what amount of hp are they adding and what's the downside (if any)?
 

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Curious, anyone doing these pulleys and if so, what amount of hp are they adding and what's the downside (if any)?
I did a pulley change on my 2010 Corvette Z06 which had the LS 427 motor (in addition to a lot of other mods). I would say in that case, it was worth it. For the Shelby, I would say no, and here's why. When you change pulleys, you will reduce the amount of charge put back into the battery. The GT350 stock battery is extremely weak in CCR already, so I would be very hesitant to reduce anything that recharges it. Actually, I am going to look into a Lithium battery replacement (they have made great strides lately) to see if that is a practical alternative. It would save at least 20 lbs of high up front end weight on this car. Anything to reduce sprung or unsprung weight on this car would be a gift that keeps on giving. For example, replacing the boat anchor 31 lb wheels with 21 lb true forged and strength tested wheels would equate to about 176 lbs equivalent of unsprung weight (reduction of unsprung rotational weight yields big returns).

Don't have money for that right now, still waiting on my DCTS steering wheel from the group buy months ago!

When I get some time, I will document some power changes that were quite effective..
 

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I did a pulley change on my 2010 Corvette Z06 which had the LS 427 motor (in addition to a lot of other mods). I would say in that case, it was worth it. For the Shelby, I would say no, and here's why. When you change pulleys, you will reduce the amount of charge put back into the battery. The GT350 stock battery is extremely weak in CCR already, so I would be very hesitant to reduce anything that recharges it. Actually, I am going to look into a Lithium battery replacement (they have made great strides lately) to see if that is a practical alternative. It would save at least 20 lbs of high up front end weight on this car. Anything to reduce sprung or unsprung weight on this car would be a gift that keeps on giving. For example, replacing the boat anchor 31 lb wheels with 21 lb true forged and strength tested wheels would equate to about 176 lbs equivalent of unsprung weight (reduction of unsprung rotational weight yields big returns).

Don't have money for that right now, still waiting on my DCTS steering wheel from the group buy months ago!

When I get some time, I will document some power changes that were quite effective..
Thx for the heads up on the pulley's, I did this mod back on a 2000 Mustang GT and while it didn't really impact charging, it also didn't make a whole lot of difference either (in hp gains) so like you stated not worth it...
Are you one of the "Lucky 11" who didn't get their wheel yet?
 

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Thx for the heads up on the pulley's, I did this mod back on a 2000 Mustang GT and while it didn't really impact charging, it also didn't make a whole lot of difference either (in hp gains) so like you stated not worth it...
Are you one of the "Lucky 11" who didn't get their wheel yet?
Yep, so far all I have gotten for all the money I paid upfront is a series of emails telling me about one delay after another...:(
 

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Yep, so far all I have gotten for all the money I paid upfront is a series of emails telling me about one delay after another...:(
SQ18, just checked in with Terrence and he's working on getting us a shipping date. He assured me that the quality would as good (if not better) than the previous supplier. In all honesty if mine arrives looking as good as the previous wheels that were posted, I'll be happy!! Going to hang in there as I really like the new wheel and want to ditch the Alcantara (suede) wheel...
 
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