SKU: 99830458255

aFe MACH Force-XP Stainless Steel Cat-Back Exhaust System - Porsche 911 GT3 991.1 H6 3.8L & 991.2 H6 4.0L

Sale price$2023.64 Regular price$2248.49
Save 10%

Pay in installments of $562.12 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

aFe MACH Force-XP Stainless Steel Cat-Back Exhaust System - Porsche 911 GT3 991.1 H6 3.8L & 991.2 H6 4.0LPerformance Gains: This system produced gains of up to +26 HP and +38 lbs. x Ft. TQ., as measured on our in house dyno. 2 1 2 IN 2 IN 304 Stainless Steel Construction: This cat back exhaust system is constructed of 2 1 2 IN 2 IN mandrel bent brushed finished 304 stainless steel tubing for maximum strength and durability. 4" Diameter Satin Black Finish Stainless Steel Exhaust Tips: Finishing off this exhaust system are dual 4 IN diameter straight cut


Performance Gains:

This system produced gains of up to +26 HP and +38 lbs. x Ft. TQ., as measured on our in-house dyno. 

2-1/2 IN - 2 IN 304 Stainless Steel Construction:
This cat-back exhaust system is constructed of 2-1/2 IN - 2 IN mandrel-bent brushed finished 304 stainless steel tubing for maximum strength and durability.

4" Diameter Satin Black Finish Stainless Steel Exhaust Tips:
Finishing off this exhaust system are dual 4 IN diameter straight-cut Satin Black Ceramic coated stainless steel exhaust tips that gives your Porsche a custom appearance.

Aggressive Sound:
This system produces an aggressive sound unleashing all available horsepower and torque.

Installation:
Utilizing factory style flanges and hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation.

Integrated Crossover Balance Tube:
This system features a crossover balance tube designed to equalize and distribute exhaust pulses reducing drone, and improving sound.

Exhaust Valves:
This system incorporates factory style pneumatic exhaust valves. The valves open the 2-1/2” Muffler bypass tube or direct the flow through the 2 IN loop pipe that replaces the factory side mufflers.

Integrated Mitered Merge Collector:
A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response.

Computer-Aided Design:
State-of-the-art computer-aided design technology is utilized for precise vehicle fitment.

TIG-Welded:
100% TIG-Welded for race-proven strength and durability.

Emissions Disclaimer:
This product does not require a CARB EO#.

aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility.

Download Installation Guide 


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • 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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 99830458255

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.6 ★★★★★
Based on 29 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
K
Verified Purchase
Kate
Waukegan, US
★★★★★ 5
Super cute, comfortable, practical, love that they are slip on
Size: 10.5, Color: Tobacco/Black
I have worn these 2-3 times already. The first day was a school/work day so I was on my feet 9 hours and the only issue I had was with the side of the boot rubbing against my ankle. I just make sure I wear socks high enough to cover my ankles or jeans that go into the boots now for long wear days. Absolutely love them! They keep my feet dry in this snow( we live in Michigan). I had been looking for a pair like this for awhile now and was getting super frustrated that I couldn't find my size in any that I liked. I saw that they had these available in a 10.5 and I wear 11. I looked at the Sorel website reviews (since the amazon ones weren't super helpful on sizing) and they said that the boots ran big so I took a chance on the 10.5 fitting me. They fit perfect. I have long narrow feet but I could see where they would be tight or uncomfortable on someone with wider feet. I've been trying to find a pair for my mom now since she has boot envy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026
N
Verified Purchase
Nicholle King
Lowell, US
★★★★★ 5
Worth it.
Size: 8.5, Color: Crushed Clay/Gum 2
Love all my Sorels. These were really cute, good color, comfortable, warm, fit well, good quality and sturdy. I would order again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2026
J
Verified Purchase
jmb02129
Lexington, US
★★★★★ 5
Fantastic Boots!
Size: 8.5, Color: Redwood/Gum 10
Completely satisfied with these boots. True to size, well made, comfortable from the get-go; not break in needed. Waterproof- really. The Red Suede has withstood a nasty winter season & still looks great. Good traction. I like the ankle height which looks good with long, mid length pants & leggings. I love the easy slip on/off aspect..made getting ready for dog walking easy. I 100%recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 11, 2026
P
Verified Purchase
Paige
Fort Morgan, US
★★★★★ 5
Definitely worth the price
Size: 6.5, Color: Black/Black
Absolutely love these boots! I originally bought them to wear in NYC in December & they did not disappoint. They were comfortable, cute, durable and worked well in the slush/snow. The traction on the bottom is also nice! They kept me warm with wool socks. I wear them almost daily now. Perfect for everyday. easy to wear with variety of outfits. Good every day shoe.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 3, 2026
K
Verified Purchase
Kimberly
Grantham, US
★★★★★ 5
Snagged a deal
Size: 7, Color: Redwood/Gum 10
I waited and waited to get these boots! I knew I was chancing it, but they went on sale, and I snagged them! I am a size 7, and they fit nicely with socks. a little loose, barefooted, but what psycho wears boots without socks? They are comfortable and really well-made.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 8, 2026

recommand products