The following components MUST be used to ensure proper fitment:OEM Audi TT 225 Exhaust Manifold
OEM Audi TT 225 K04-020, 021, or 023 Turbocharger
Over the years the Audi TT K04-020 turbocharger has proven to be a worthwhile upgrade on the K03 equipped mk4. Since the release of a few bolt-on K04 turbocharger kits the DIY crowd has been scouring the TT classifieds piecing together kits for less. Until now, no bolt-on downpipe has been available which allows the TT 225 K04-020 turbo and manifold to fit the mk4. Those days are over!
This 3" downpipe begins at the turbo with a CNC machined turbo flange and the tightest 3" mandrel bend possible. The remainder of the downpipe is CNC mandrel bent in one piece to add strength and eliminate unnecessary welds. A stainless steel flex section is used to absorb engine movement. After the flex section a CNC machined flange connects to an optional 3" high-flow cat. 42 uses Magnaflow catalytic converters for all of their downpipes. After the cat, a custom adaptor allows perfect bolt-on fitment to any aftermarket cat-back. We offer adaptors for stock sized exhausts, 2.5" and 3". The whole downpipe bolts together to ensure zero leaks and zero problems. Triple layer graphite gaskets and grade 5 locking hardware are used for the tightest fit.
The modular nature of this downpipe allows the user to change configurations at any time. For example, the downpipe may be purchased with a stock sized adaptor and connected to stock or any basic aftermarket cat-back exhaust. At any time a 2.5" or 3" cat-back can be installed using the appropriate adaptor. 42 Draft Designs 3" cat-back systems are completely compatible with this downpipe allowing the possibility of a 3" turbo-back in any configuration. On race days the catalytic converter can be easily swapped for a test pipe.
Besides price, the biggest worry on the minds of DIY builders is fitment. This K04 downpipe was designed using precision tooling and the OEM Audi TT 225 turbocharger and exhaust manifold. Rigorous testing was done to repeat the phenomenal fitment of these mk4 1.8T 3" downpipes. 42's downpipe fits like an OEM downpipe would and an aftermarket downpipe should - no rubs, no rattles, no problems.
Please note that when using a "race" series kit (test pipe in place of a catalytic converter), you may get a Check Engine Light due to the lack of a converter. This can be avoided by using a system that utilizes a catalytic converter, an oxygen sensor spacer, or some type of aftermarket ECU tuning, such as APR Tuning.
There are many aftermarket exhaust manifolds available which mimic the OEM TT 225 fitment. Avenue Autosport has not tested any of these manifolds and cannot guarantee proper fitment with our 3" downpipe. Additionally, many knock-off K04 turbochargers are available which claim to replicate the OEM turbocharger. We cannot support or guarantee fitment of this downpipe when the proper OEM components are not used. This downpipe was designed to exactly replicate the fitment of the mk4 downpipe. It has not been tested on mk2 or mk3 1.8T swap applications.
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