Air and Fuel› Intake Manifolds and Components

FAST

Big Mouth 102mm T-Body w/o TPS/IAC

$236.95

SKU: F003 54102

In Stock
In Stock
Ships by Oct 8
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The FAST 54102 is a 102mm Big Mouth throttle body designed for multi-port injection systems. Machined from 6061-T6 billet aluminum with a clear anodized finish, it features a 102mm venturi diameter. It does not include the TPS sensor, IAC motor, gaskets, hardware, or injectors.
Show original supplier description

Part #: 54102

FAST Big Mouth Throttle Bodies for the LSX 92mm and LSXR

The Fast Big Mouth 102mm throttle body provides increased airflow through a smoother offset blade pivot. In addition we increased blade thickness to eliminate deflection and a beefed up linkage and spring mechanism.

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Vehicle Symptoms
  • restricted airflow at high rpm
  • loss of top-end horsepower
  • sluggish throttle response on built LS
  • engine feels starved above 6,000 rpm
  • stock throttle body bottlenecking high-horsepower build
Relevant Conversations
  • FAST 102mm Big Mouth throttle body review LS
  • FAST 54102 vs Nick Williams 102mm throttle body
  • will FAST Big Mouth 102 fit FAST LSXr intake
  • FAST 102mm throttle body install cable linkage
  • does 102mm throttle body add horsepower on LS
  • FAST Big Mouth throttle body no TPS IAC wiring
  • 102mm throttle body for 427ci LS build
  • FAST 54102 idle adjustment and tuning
  • FAST throttle body with LSXr manifold combo
  • cable operated 102mm throttle body LS swap

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandFAST
Part NumberF003 54102
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1M+ Enthusiasts
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(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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