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I have a 15' GT with aftermarket MRR 350 rims. I have GT350 replica fenders installed & wanted front rims pushed out a little for looks. Got 1/2" longer APR studs & 8mm spacers from Optimum Performance. When installing @ shop, existing lugs would not clear longer studs & were bottoming out. Lugs...

I have a 15' GT automatic with the following mods done: Lund Flex Fuel Tune, Mishimoto Inlet Tube, Velossa Big Mouth. Want to get most HP/TQ without going FI route. Want suggestions for exhaust & long tube headers. Not a fan of loud exhaust so I want the best gains but exhaust to sound close to...

I recently got my Lund flex fuel tune. Previously has a 93 tune. Loaded flex fuel tune & filled up with e85, only had 2 miles of 93 left in tank. Idled for 10 plus minutes & after ALCH_PCT% was @ 35% drove it gently till ALCH_LEARN FLAG locked in & changed from 0 to 1. It got to 65% & locked in...

I just had C/F Anderson Composites GT350 fenders painted & installed on my car. Manufacturer states they are .4" wider than OEM. I have 19" x 10" MRR M350 Graphite rims on car, 19" x 11" in rear. Rear sits flush with fender from the side view. With OEM fenders front tires were just in from...

What is a key cycle & how do you do it with a keyless car like the mustang? From Tuner: Here's the emissions tune. You'll need to fill it up with a full tank of gas to reset the drive cycle process on it. Then put about 75-100 miles on it with varying loads from idle to wide open throttle to...

For Sale: 2 Brand new never used or mounted MRR M350 19" x 10" Gun Metal Rims. Selling because I decided to go staggered setup. Paid $750, will sell for $500 picked up (I live in central New York) or $625 shipped to lower 48 states, NO TRADES.

For sale: 4- 1" Billet Aluminum Hubcentric Spacers, fits 15' 17' Mustangs. Bought new aftermarket rims & tires, not needed anymore. Purchased brand new for $170, never installed, sell for $110 shipped, no trades.

Can someone who has the repair manual or has personally removed this panel tell or attach diagram of removal procedure. Thanks in advance.

Saw this on LMR.com under new items. Comparable with corvette ZL1 rock guards. Anybody get these yet? https://lmr.com/item/LRS-157364/15-17-mustang-splash-shield-kit-cpc-ext-157-364

Have MRR 350 rims, staggered setup (10" front/11" rear). Rear- going with Nitto NT05R 305/35/19 (27.44 tall). Fronts is where I'm undecided. Either Nitto NT05 275/35/19 (26.65" tall) or Nitto 555G2 275/40/19 (27.68" tall). Base GT, staying stock ride height, Pirelli (27.3" tall). What's...

There are these holes with clear vinyl over them on each side of trunk. They look like drain holes. Is that what they are? Does anybody else have these holes that are covered up?

Have 235/50/18 Pirelli tires on stock rims. Want to swap tires using same rims to Bridgestone Potenza RE-71R 245/45/18. Will these fit? 27.3" Pirelli, 26.7" RE-71R diameter. Width is 9.3" Pirelli, 9.6" RE-71R width. Tirerack says not any size RE-71R will fit 15' Mustang GT (Base GT) 18" rim. Is...

Have a 15' auto Base GT with the 18x8 OEM rims, 235/50/18 Pirelli tires. Want a tire to use on these rims. Only warm weather driven, no winters. Mods are 93 Lund Tune & Pedalmax. Pirellis suck @ holding the extra power on street & track. Need a tire with much better dry traction. Will sometimes...

Anybody have any real time experience running this exact combo @ 1/4 mile track?

I found this part on the floor near D/S seat midway thru during my install of my JMS Pedalmax. Does anybody know where this goes? It looks like it covers something that protrudes.

What vendors with excellent customer service: sell, install & dyno tune Whipple kits all in one shop on the east coast? Looking for everything done in one spot. Travel isn't a major concern as long as I get the all of the above. Leaning towards Whipple tune but not 100% sure. Will probably want...

I see people post pics that are rotated or upside down. I tried to save there pic & repost correct way but preview shows it the same way as person posting. How do I change my orientation when posting pics?

I have had my car 3 weeks & decided to run at the local track to get a baseline before modding begins. Car is completely stock with 1/2 a tank of gas, 15' base GT auto with 3.15 gears. Around the water box, no B/O, traction control & advancetrac off, gear selector in "S" Sport mode, 26 psi rear...