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I ran staright pipe on a normally aspirated 4 cylinder on my last car. It sounded great but you could barely hold a conversation while inside. But until I get it on the car I really won't know.
How much power would you pick up with the 2.5 catless dp on a car with no tune?
You will see a peak gain in Hp and TQ, but it will be all in the top end of the RPM range, like 6k and up. Below the 4.5 k range it will loose almost as much as it gains up top. You can basically picture the dyno looking like a bow tie with the before and after lines. With out a tune a catless DP isn't worth it.
Since some dealers/installers of the new JCW kit are not installing the included manifold (there is supposed to be a TSB on this saying it is not required on US cars) because it is much more time consuming. I have to wonder if this is the source of these manifolds. AKA: leftover parts
You will see a peak gain in Hp and TQ, but it will be all in the top end of the RPM range, like 6k and up. Below the 4.5 k range it will loose almost as much as it gains up top. You can basically picture the dyno looking like a bow tie with the before and after lines. With out a tune a catless DP isn't worth it.
Thx for the good info, wouldn't the catless dp make te turbo spool faster? And WMW did not post gains from the exhaust manifold? How are you going to sell a product with very little info about it..
I really doubt there is going to be any real gains other then better turbo spool and better exhaust flow
With a tune you should see good low, mid, and high end gains. TBH AP, catless DP, and FMIC are a really good start out combo for making an MCS pretty quick.
