SKU: 80639742607
straight cut gears

straight cut gears IAG Performance 1st-4th Straight Cut Gear Set

Sale price$22.02 Regular price$24.47
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Ships within 48 hours · Estimated delivery Sep 5 - Sep 10

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Description

straight cut gears IAG Performance 1st-4th Straight Cut Gear Set2004 2021 Subaru WRX STI 1st 4th Straight Cut Gear Set by IAG Performance Gone are the days of blowing up stock six speeds, or having to resort to race only solutions to support the high power levels that built Subarus now produce. The IAG Spec PPG Straight Cut 1 4 Synchro Gear Set is designed for weekend racers (and weekday racers for that matter) who prefer the streetability of a synchronized gearbox which is suitable for daily driving. The kit

2004-2021 Subaru WRX STI 1st-4th Straight Cut Gear Set by IAG Performance

Gone are the days of blowing up stock six speeds, or having to resort to race-only solutions to support the high power levels that built Subarus now produce.

The IAG-Spec PPG Straight-Cut 1-4 Synchro Gear Set is designed for weekend racers (and weekday racers for that matter) who prefer the streetability of a synchronized gearbox which is suitable for daily driving. The kit features strong, straight-cut gears (vs. traditional helical gears) which provide maximum performance and durability for high horsepower Subarus and can be safely driven on the street.

IAG engineers worked directly with PPG to specify custom gear ratios which allowed us to increase top-speed in 1st and 4th gear. This change will prevent extra shifts while drag racing. Additionally, the gearset is designed to utilize the OEM 5th and 6th gears for quiet highway operation and maximize streetability.

While the synchronizers improve drivability for the street, the taller 1st and 4th gears are the stars of the show when it comes to racing and all-out acceleration. A 1st Gear Ratio of 3.077 results in an 8-10 mph increase vs. OEM (years vary) while the new 4th Gear Ratio of 1.042 will ensure that you finish out your quarter mile pass without shifting to 5th.

Sub 10-second street Subarus are all the rage right now. The partnership between IAG and PPG combines our experience to offer a robust but versatile combination that appeals to those who want the strength of a built transmission, but don't want to give up driving the car on the street. Pfitzner’s legendary strength and durability paired with IAG’s insight on gear ratios and specifications has resulted in a product that we know will be a game changer in the Subaru community.

Features

  • Longer Gear Ratios for Less Shifting

Benefits

  • Stronger than OEM to Handling Higher Power Outputs

Applications

  • 2004-2021 Subaru WRX STI

What's In The Box?

  • 1 - Input Shaft
  • 1 - 1st Straight-Cut Output Gear
  • 1 - 2nd Straight-Cut Output Gear
  • 1 - 3/4 Straight-Cut Cluster Gear
  • 1 - 3rd Straight-Cut Input Gear
  • 1 - 4th Straight-Cut Input Gear
  • 1 - Clutch Input Shaft
  • 1 - Reverse Idler Gear
  • 1 - Input Shaft C Clip
  • 1 - Retainer Key

Warranty

  • IAG Performance's Limited Manufacturer's Warranty
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 80639742607

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Sugg843
Carnegie, US
★★★★★ 5
Prom Time🙌🙌
Color: Gold, Size: Medium, Color: Gold, Size: Medium
I purchased this suit for my son’s prom, and it exceeded our expectations. The fit was true to size, the material feels good quality, and it looks very sharp in person. He was comfortable wearing it all day, and it gave him a polished, confident look for his special day. I would definitely recommend this suit to anyone looking for a stylish and well-fitting option!
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Reviewed in the United States on February 23, 2026
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ANGELA CHARLES
Lowell, US
★★★★★ 5
Great suit.
Color: Gold, Size: Small, Color: Gold, Size: Small
Great suit. Well worth it.
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Reviewed in the United States on April 27, 2026
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Anita Schneck
West Palm Beach, US
★★★★★ 4
Excellent quality for an excellent price tag
Color: Blue, Size: Medium
The suit arrived in 2 days after ordering; it arrived in excellent condition, was wrapped in clear plastic, however it was only in one package and should have been wrapped in a second layer in case of accidentally opening during the shipping process. The suit was folded very neatly, I'll keep it as is as it's a gift for a friend of mine who is a musician and he will use it for performance on stage. The size was M and correct. Unfortunately, it has arrived in the wrong color, I ordered blue, and purple has been delivered. I hope, he likes it anyway. I'll keep it as it is too inconvenient for me to exchange it and ship it back to the sender.
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Reviewed in the United States on August 16, 2025
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LeeLee
Bozeman, US
★★★★★ 5
Beautiful suit
Color: Purple, Size: Small
Suit is better than I expected. Bought this for my son for prom. The sequins POP. I am highly satisfied with this purchase. My son is 5'6 about 130 lbs and I ordered a size XS and it fit perfect. The only complaint I have is there is a hole for a button but no button is attached to the suit. Besides that, GET IT.
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Reviewed in the United States on April 9, 2026
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Netta
New York, US
★★★★★ 5
Great suit
Color: Purple, Size: X-Small
Fit my husband perfectly for our friends wedding and it was comfortable. It doesn't get wrinkled fast if at all. The quality was not bad for the price.
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Reviewed in the United States on January 14, 2026

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