Exhaust Difference

V6power · Post by **V6power** » Fri Apr 06, 2012 10:03 am

I was thinking about this last night and realised I don't actually know the answer.

what is the difference performance wise between a stainless steel system and a mild steel system?

obviously the stainless steel will last longer but thats about as much as I know.

gsi pie · Post by **gsi pie** » Fri Apr 06, 2012 10:10 am

both got different sound to them to fella

V6power · Post by **V6power** » Fri Apr 06, 2012 10:15 am

Yes I know about the sound, quality etc. was more interested in the performace side. anyone ever used a friedrich motorsport system?

Gaz · Post by **Gaz** » Fri Apr 06, 2012 10:32 am

nothing performace wise, mild is quieter stainless lasts longer

V6power · Post by **V6power** » Fri Apr 06, 2012 10:42 am

Thanks for that

bigmitch · Post by **bigmitch** » Fri Apr 06, 2012 11:01 am

The 20xe was orginally rated at 170bhp it's the exhaust that reduced the power
this is pinched for sbd motorsport page

I know this isn't what is being asked but it does prove exhaust does make a power difference

General performance pointers on the C20XE and LN exhaust manifolds

So, how do you set about tuning C20XE and LN engines? Well, step number one is replacing the standard exhaust manifold, as the standard item was designed to maximise low-end torque. At high revs this becomes a restriction, so it's critical that it's upgraded at the earlist opportunity. Steve explains - "Apparently the first pre-production engines from Cosworth produced 170bhp as standard but they wanted more torque for the road which they got by making the manifold's pipes smaller. This also helped reduce emissions by keeping the gas speed up, but when you get up to the top end it becomes a restriction."

Happily, SBD has a huge range of manifolds for a wide variety of applications, whether front-wheel drive Astra, Westfield, Caterham or rear-wheel drive Escort or Manta. Prices range from £229.70 to £586.91 depending on applications, but if you don't attend to this early on, you're not going to produce the quoted power outputs as outlined here. Bear in mind that even on a standard engine a 6-8bhp gain can be expected when used with an efficient exhaust system.

V6power · Post by **V6power** » Fri Apr 06, 2012 11:55 am

well when I had my XE I put it on the rollers when it was completely standard, it made 156bhp. I then fitted a sportex manifold and decat, put it on the same rollers and it made 167bhp. Loved that XE, until it went bang.

oh and mines was the later coil XE with GM head.

Kevwaggy · Post by **Kevwaggy** » Fri Apr 06, 2012 12:16 pm

It's not what the exhaust is made out of that changes the power tho, it's the internal diameter, flow rate, silencer restrictions, cat, etc

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