SKU: 20201478573
why are straight cut gears better

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

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Description

why are straight cut gears better 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:
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  • 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]
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SKU: 20201478573

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L.M.
Birmingham, US
★★★★★ 3
Beige Liner picks up lint, difficult to clean
Color: 1-Black, Size: S, Color: 1-Black, Size: S
I purchased this for my husband to organize things on his nightstand. The design is good and it looks nice, but the interior part with the beige suede picks up dark lint and is difficult to clean. It just makes it look dirty. I've tried vacuuming it, using a lint brush, taking it off with tape, etc. to no avail. It would be better if the inside was the same black material as the exterior.
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Reviewed in the United States on June 30, 2022
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Michelle Renee Shaffar
Carnegie, US
★★★★★ 5
Great for use atop the bedside table!
Very nice! I bought this for my father for his birthday, and he really liked the gift! It's a nice little place for him to keep all of his essentials together on the bedside table. No more losing his watch, keys, wallet, etc. or knocking them off the table!
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Reviewed in the United States on April 12, 2026
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Joselyn
New York, US
★★★★★ 5
Excellent stylish organizer!
Excellent design and quality of material, practical and functional!
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Reviewed in the United States on October 1, 2025
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Charles
Whiting, US
★★★★★ 5
Love it
It looks good and is well made.
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Reviewed in the United States on November 2, 2025
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Elizabeth Barrientos
Los Angeles, US
★★★★★ 5
Bedside organizer
Perfect gift for my boyfriend. It is sturdy and is able to get all his stuff in it, they size is perfect it fits great on his nightstand stand, it was easy to use/organize all his stuff and it is light weight
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Reviewed in the United States on January 3, 2026

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