Adding catless downpipes to Dinan Stg. 2 N54?

[xflowgolf]

I purchased my 2010 135i equipped with Dinan Stage 2 goodies, and after owning it a year I'm itching for more. Currently the downpipes/mids are stock with a Dinan rear muffler section.

I've read Dinan doesn't "support" catless downpipes, but I'm well past any warranty concerns at 100K, and am looking to get more out of the car.

Has anyone run catless downpipes with the Dinan Stg. 2 software? Will it play nicely together? Will it throw a CEL for cats and is there a workaround?

Thanks!

[Cmoney135i]

also interested

[xflowgolf]

leaning towards just dropping the Dinan tune and going to an MHD setup to make the most of the catless downpipes and fmic.

Was hoping to just plug pipes on and run, but the lack of responses isn't giving warm fuzzies.

[dsocold]

check engine light will come on. and yea get the mhd, the dinan tune will not take advantage of the catless downpipe like a tune thats specifically created for that purpose. with dinan maybe expect to see about 5hp from the better flow with a better/faster spool up. moving to mhd will blow your mind away even without the downpipes.. i came from cobb ap and mhd is just crazy smooth and fast