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Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car
Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car, view 2Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car, view 3Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car, view 4Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car, view 5Stirlingkit OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car, view 6
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OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe Set for 1/8 Car

$699.99

In stock at stirlingkit.com

The O.S. Speed R21 GT is a 3.49cc .21 nitro engine for 1/8 GT on-road racing, introduced at the IFMAR world championships. It uses an improved R2101 crankcase, IFMAR-compliant porting, a DLC-coated crankshaft, a cooling-focused head and a double-adjustable 22E(B) carburetor with a 7mm reducer. The $699.99 set includes T-2060SC and manifold.

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Highlights

  • 3.49cc (.21) GT racing engine
  • DLC-coated crankshaft with counterweight
  • IFMAR-compliant ports and 7mm reducer
  • Double-adjustable 22E(B) carburetor
  • T-2060SC pipe and manifold included

Best for

1/8 GT on-road nitro racers.

Things to consider

  • Needs careful break-in per O.S. instructions.
  • Glow fuel, starter and plugs aren't included.
  • Built for racing, not casual bashing.

Key specs

Price$699.99
Displacement3.49cc
Bore x stroke16.08 x 17.20mm
RPM range4,000 to 42,000
Output2.65ps @ 34,000rpm
Weight369g

Our take

A purpose-built GT racing .21 with the matching pipe.

OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… at a glance

BrandStirlingkit
Price$699.99
TypeRC Engine
AvailabilityIn stock at stirlingkit.com
Couponstart
ReturnsThe about page lists a 30-day return or exchange. All returns need an RMA requested via…

Price check

At $699.99, the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… is toward the top of Stirlingkit's price range, whose 2,729 listed products run $0.54 to $11,000.

Similar items from other brands we track run $9 to $59.99.

Buying from Stirlingkit

Stirlingkit is a good source for hobbyists who want running miniature engines, Stirling and steam models, and build kits that most toy stores never carry. Skip it if you need fast, cheap returns, since everything goes through an emailed RMA to a Shenzhen address. Check the shipping method and warehouse at checkout first, because airmail can take 15 to 35 business days.

Shipping
Airmail takes 15 to 35 business days, EMS 5 to 8, and DHL Express 3 to 7. Shipping fees vary by product, warehouse, and destination and show on each product page and at checkout.
Returns
The about page lists a 30-day return or exchange. All returns need an RMA requested via service@stirlingkit.com, and items must include original packaging and accessories with no physical damage.
Warranty
The about page lists a 1-year warranty and lifetime customer support.

Read our full Stirlingkit review and shop all products →

Frequently asked questions

What car is the O.S. R21 GT for?
1/8 scale GT on-road racing cars.
Is the exhaust included?
Yes, the T-2060SC set with manifold comes with it.
How much is the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe…?
Stirlingkit lists it at $699.99 on stirlingkit.com. We refresh prices throughout the day, but always confirm the final price at checkout.
Is there a coupon code for the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe…?
Stirlingkit's store-wide code start can be entered at checkout on stirlingkit.com. Stirlingkit sets the discount, and some items or sale prices may be excluded.
What is Stirlingkit's return policy?
The about page lists a 30-day return or exchange. All returns need an RMA requested via service@stirlingkit.com, and items must include original packaging and accessories with no physical damage.
How long does Stirlingkit take to ship?
Airmail takes 15 to 35 business days, EMS 5 to 8, and DHL Express 3 to 7. Shipping fees vary by product, warehouse, and destination and show on each product page and at checkout.
Does the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… come with a warranty?
Stirlingkit's published warranty terms: The about page lists a 1-year warranty and lifetime customer support.
Where can I buy the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe…?
The OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… is sold directly by Stirlingkit on stirlingkit.com. The Shop now button on this page goes straight to the product there, and code start can be applied at checkout.
Is the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… in stock?
Yes. Stirlingkit lists it as in stock on stirlingkit.com as of our latest check. Stock and prices refresh throughout the day.
Is Stirlingkit a legit store?
Stirlingkit is a good source for hobbyists who want running miniature engines, Stirling and steam models, and build kits that most toy stores never carry. Skip it if you need fast, cheap returns, since everything goes through an emailed RMA to a Shenzhen address. Check the shipping method and warehouse at checkout first, because airmail can take 15 to 35 business days. Our full Stirlingkit review covers shipping, returns and what to check before ordering.
Is the OS Speed R21 Level 21 3.49cc GT Racing Engine Exhaust Pipe… expensive?
At $699.99 it is toward the top of Stirlingkit's range ($0.54 to $11,000 across 2,729 products), and similar items from other brands run $9 to $59.99.

More from Stirlingkit

Shop all Stirlingkit →

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