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The factory silencer on the later series has a smaller diameter by-pass pipe - 48mm - and a larger, 76mm pipe (with a crushed section!) to the tailpipe.

I cut the silencer open because I'm always curious! See images for more info. When that exhaust valve is 'closed' the gases are guided through the 48mm by-pass pipe continued inside the silencer body. The gas-flow is then reversed through the two 38mm pipes. So far, so restrictive! All with the aim of reducing the decibels to help pass the strict EU drive-by noise test. When the exhaust valve is 'open' the gases flow through the 76mm straight to the tailpipe. Some noise-reduction is achieved by using a short perforated tube. 

Designing this 2bular valved system, I decided to keep both pipes straight-thru. The by-pass pipe using 63.mm perforated tube, surrounded by hi-quality Acoustafil ZT-1 packing material. It merges with the plain 70mm pipe just before the silencer exit which runs direct to the 2bular tailpipes. Valve 'closed' is almost as quiet as factory - no need to upset the neighbours! When the valve is 'open' - with a straight-pipe to the tailpipes - the exhaust note rises to a HOWL - very addictive.

THIS IS NOT A TRACK EXHAUST! Apart from it being waaaaaay too NOISY,  the silicone seal inside the little vacuum chamber distorts with the excess heat and you lose control of the valve. It's an easy fix swapping out the chamber but as I said - the decibels are too much for track-use. Great road-car exhaust though!

On this install, the whole exhaust valve bloc along with its 50mm long slip-on section, pushes the main pipe towards the rear of the car requiring an awkward kink back into the silencer. I wanted to straighten everything out so I use a V-band connector at the join of the 3rd catalyser (or plain link-pipe) and the valve bloc. Stops that ugly black gunk falling onto the shiny anti-roll bar heat-wrap!

CHOOSE YOUR TAILPIPE OPTION AND MAKE A NOTE ON THE ORDER FORM - STAINLESS/CARBON/TITANIUM.

THIS 2BULAR EXHAUST COMES WITH ITS OWN LINK-PIPE TO THE 3"dia (76mm) DOWNPIPE.

LEAD TIME: 2 weeks