Decat DP but catted centre pipe ????
Interested to know if anyone is running with this configuration.
Also love to know the performance of following configurations compared to the original catted system on a UK turbo:
- catted DP + straight through centre + SS BB
- decat DP + straight through centre + SS BB
- decat DP + original cat centre + SS BB
Anyone like to take a stab as to the +/- BHP/torque for these systems?
Ta Pete

 

I asked the question about the catless downpipe too and everyone said if the car if fully up to temperature then it'll pass the MOT.
I'm getting my SS DP fitted in the next couple of weeks so I hope what I said is correct.

 

So it sounds like a <hot> scooby would also pass the road side test as well then

 

whats a roadside check?

 

I did the MOT the day before getting the DP fitted last week. I will go back in this week to test the emissions but I think it was Pete at Scoobysport that said if the middle cat is fully functional and the exhaust is hot it will pass. Let's hope so. My cars only done 15k miles so the cat should be in good order.

As to setup (SS BB & DP, standard mid with CAT, ITG filter) and differences over the standard car it is early days but my first thoughts are :- pulls earlier (2000rpm ish) but much more subtely. There is no big whoosh at 3000 rpm anymore. It did make me wonder if something was wrong because it didn't feel as fast, but I know it is faster (there are sections of roads you know at what speed you can do and i can do more now).

The best thing is the deep growl/burble (i mean really deep) at low speeds and tickover, and the pronounced whiz of the turbo. On the motorway it isn't too much different than before noise wise but with more low down torque. I can now cruise around town in 5th and it looks like my petrol isn't wasting away (may do more than 22mpg - a record), despite being in low gears a lot and booting it (just for the noise).

I will probably get some sound deadening material for the boot because I want it extra quiet on motorways. Even though it's not changed that much from the original you can still hear it when cruising.

Hope this helps. I definitely recommend it.

J

 

Thanks James, great info on what I can expect then
I'd like to get the decat DP, but I'd really have to replace my straight through mid section for the original cat version.....
I look forward to hearing how you get on with the emissions
SCOSaltire - roadside checks are where PLOD can stop you and do am emissions test there and then
Pete

 

My MOT is due this week so I will tell you what happens. I plan to just put the centre section back on. Had no luck trying to talk nicely to MOT places!

Also does anyone know if i will have to replace the BB as well as is a HKS Hiper.

 

Mine failed with just a DP

I couldn't be bothered with all the swapping about so I bought a PE catted centre and that works fine.