so it’s time to change the exhaust ( before it falls off on its own, or mr mot frowns at it) The van(76 bay 2.0lt) has an eberspacher and the heat exchangers haven’t been plumber in since before I got it so I’m thinking I may as well go for J tubes rather than heat exchangers I’m pretty set on stainless so I didn’t have to worry about it all again Do I go for equal length j tubes or standard type ones , What are the advantages and or disadvantages. Do they heat things that don’t like heat, do they sit lower than stock system, I’m guessing they make no difference to power . Pics of installed stainless and tubes from CSP / VW Speedshop /TT would be welcome Cheers all
The heads on a T4 are cooled partly by the air blown through the heat exchangers as there is a shorter exhaust stub before the fins . than on a T1 . Changing to J tubes from even leaky heat exchangers may result in a greater chance of overheating your heads. Or a greater chance of "having" to go Scooby if you want that... Even on a T1 engine you should be using different industrial under engine tins to control the air flow if you fit J tubes.
So j tubes aren’t fit for purpose on a 2lt engine? Are there tinware available to make them a viable option?
I wouldn't say that ... Lots of people run J tubes ( me) with no ill effects . Heat exchangers are very restrictive so larger bore J tubes especially equal length ones will increase exhaust gas exit . Mine are wrapped as well
