If you are looking for pure performance without emission control requirements, then choosing our 3'' Modular exhaust system - Decat is the right choice.

This decat component is a part of a fully modular GMS 3'' exhaust system and can be combined with all the other GMS exhaust parts you need.

Dyno proven, 7hp - 11hp power increase over stock exhaust system on stock 4C

Dyno proven, 16hp - 23hp power increase over stock exhaust system on ECU tuned 4C

Next step is GMS 3" Midpipe.

ALFA ROMEO - 4C - 3'' Decat

SKU: GMS4CMESDC

From 360,00€

Lightweight 640g vs. stock cat (4.200g cat + 620g bracket)

7hp - 11hp power increase over stock exhaust system on stock 4C

16hp - 23hp power increase over stock exhaust system on ECU tuned 4C

Plug and play

Decat system (race use only)

3'' / 76mm diameter

Simple, minimalistic and effective high flow design

Back purged TIG welded

Quick release V-band clamps for easy installation

T304 Stainless steel

Less engine heat

Less backpressure

Less turbo lag

Better throttle response

Faster gear shifts

Laser engraved GMS logo

Requires GMS 3" Downpipe
Due to material characteristic of T304 stainless steel, colors will change depending of the temperature the parts will be exposed to.

This 3'' decat cat can trigger check engine light.

For best results engine remap is suggested but not required

Intended for race and track use.
DHL Express shipping (2-3 days within Europe and 3-5 days worldwide).
Due to technical nature of the GMS products, to prevent reverse engineering, the returns are not accepted under any circumstance, therefore we encourage the customers to carefully review the order before making the purchase or contact us in case of any questions.
Motorsport rated, capable of race use.

12 month limited warranty (Improper installation or use voids any potential warranty claims).

Due to the nature of our products (lightweight, high end racing components used in extreme conditions) limited lifespan is to be expected.

We strive for best customer support and satisfaction so in case of any issues we'll take care of you at our best effort.

ALFA ROMEO - 4C - 3'' Decat

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