Per­for­mance Ex­hausts

Fast Car - - TOP 10 FAST ROAD MODS -

Get­ting the max­i­mum air­flow into an en­gine is one thing, but it’s just as cru­cial to get the gases out as ef­fi­ciently as pos­si­ble af­ter com­bus­tion. This is ex­actly where an ef­fec­tive per­for­mance ex­haust will bag you more horse­power. Ba­si­cally speak­ing, out-and-out race ex­hausts are built to elim­i­nate as much of the flow re­stric­tions as pos­si­ble, and this comes down to two con­sid­er­a­tions – de­sign and pipe bore. A good fast-road ex­haust sim­ply of­fers a com­pro­mise be­tween the ex­tra power and prac­ti­cal­ity – con­sid­er­ing all the help­ful stuff like not mak­ing you go deaf or get­ting you nicked.

In an ideal per­for­mance world, most ex­hausts would be straight, short and re­stric­tion free. But that’s not pos­si­ble on road cars with­out mak­ing them im­prac­ti­cal. So, a per­for­mance ex­haust man­u­fac­turer will usu­ally fol­low the de­sign of the orig­i­nal closely but will smooth out bends as much as pos­si­ble. They’ll also take out much of the re­stric­tion caused by mul­ti­ple si­lencers, un­nec­es­sary pipework and baf­fles. These will be sound-tuned so they’re not un­bear­able – in most cases not that much louder than stan­dard – but, im­por­tantly, they will up the grunt.

In­creas­ing bore is an­other way of in­creas­ing gas flow, but it’s a bit more com­pli­cated than mak­ing your pipe as big as pos­si­ble. Well-de­signed per­for­mance ex­hausts will of­fer a larger di­am­e­ter but only when it’s needed. On a N/A en­gine the scav­eng­ing ef­fect is needed to help pull through the gases faster. In a tur­bocharged en­gine, the scav­eng­ing isn’t needed so a big­ger pipe is more ad­van­ta­geous. Su­per­charged en­gines are some­where in be­tween. So there you go.

Top Con­tact Mill­tek – www.mill­tek­

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