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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25
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Description
MUSTANG GT500 2007-2009 WHIPPLE DS STAGE 4 open filter inlet whine mod kit 75% WHINE INCREASE SKU 155Increases the in cabin rotor sound by up to 75% Foster SC Stage 4 Kit works on both closed air box and open filter or aftermarket CAI systems. Drilling through the firewall required. Connects from inlet pipe through the OEM sound tube location. Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin. For drivers side supercharger inlets setups.
- Increases the in-cabin rotor sound by up to 75%
- Foster SC Stage 4 Kit works on both closed air box and open filter or aftermarket CAI systems.
- Drilling through the firewall required.
- Connects from inlet pipe through the OEM sound tube location.
- Sealed sound tube with special diaphragm cap installed on end of sound tube inside cabin.
- For driver’s side supercharger inlets setups.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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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
4.9 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Perfect!!
As I expected, no more to say only I'm happy I got it.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Works great
Works great
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Reviewed in the United States on March 30, 2026
★★★★★ 5
exact fit
working good
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Fast delivery.
Great product. OEM spark plugs.
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Reviewed in the United States on January 5, 2026
★★★★★ 5
Fits 2011 335xi n55 prefect
Fits my 2011 335xi n55 engine perfectly. Comes on and off easily and gets the filter loose quickly. Amazing quality
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Reviewed in the United States on March 15, 2026