big gun Eco exhaust

2277 Views 15 Replies 4 Participants Last post by mac102004, Nov 29, 2017

jrcowboy

Discussion Starter · Nov 27, 2017

so im looking to buy a 08 420 rancher and i wanna put an exhaust on it, do i need a fuel chip for a big gun eco?

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SamUK

· #4 · Nov 28, 2017

mac102004 said:
Yes you ALWAYS need a tuner when you add an exhaust or any other power mods to an EFI machine, they are all tuned on the lean side to start with to meet emissions and adding an exhaust only makes it worse. Throw a tuner on it even a cheap one, it will save your engine in the long run and keep it running much cooler.

Some guys say the exhaust isn’t worth the money but your looking at a 10-15% increase in RWHP typically, so I would say that’s worth it !

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Your in CanAm mode Mac, 10-15% more power on a Rene is worth it, on a Honda.... It’s negligible.
A cam with tuner would be the ideal way forward IMO.

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SamUK

· #6 · Nov 28, 2017

Bang for buck though... Cam and tuner by far. Exhaust is always last job when building or tuning an engine. Big HP and an exhaust results in a loss of power.
Just trying to save the OP some dollars.

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We’ve obviously been taught differently lol.

Personal opinion on bolt on tuning... waste of time and money unless you have the CC’s to need said bolt ons.
If you want power, then you need cubes, if you ‘ain’t got cubes every else is irrelevant.

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SamUK

· #11 · Nov 28, 2017

jrcowboy said:
thanks for all the feedback everyone, im mostly looking for a better sound output and maybe a bit more airflow, i'll keep the stock exhaust for a while and down the road ill do a tuner and muffler, thanks!

You’ll get away with a back box/muffler for sound, to alter the airflow I assume you mean induction, to do so you’ll still need a tuner. More air requires more fuel.
The basic idea of an exhaust is to create negative back pressure, IMO you’ll not create enough back pressure with a tuner to need to replace or modify your stock exhaust. I’m only giving my opinion of course, you do what you feel is necessary and what makes you happy

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