Product images and videos 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.
Exhaust› Mufflers and Resonators
Hooker
MUFFLER, SLIP-IN
SKU: H00I 21003HKR
Easy — 1–2 hours
Overview
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Part #: 21003HKR
For 4 in. side tube sound control, Hooker builds long lasting slip-in mufflers. These mufflers are easily removed for racing purposes and are available in a performance style glass pack or our quieter all metal reverse flow style for small and big block applications. Hooker mufflers produce a high level of sound control without restricting engine efficiency. Sold in pairs.
Features:
- Fits 4" Side Tube systems
- Long Lasting
- Big Block Reverse Flow Design
- Easily Removed For Racing
- Easily Removed For Racing
- Quieter Than Glasspack
- Efficient Design yet much Quieter than Glass Pack
- High Level Of Sound Control
- High Level Of Sound Control
- Will Not Restrict Engine Efficiency
- All Metal Construction
Super Competition Sidetube Muffler | Slip-In | Sold In Pairs | 4 in. | All Metal | Reverse Flow
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
| Brand | Hooker |
| Part Number | H00I 21003HKR |
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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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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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