I would seriously look at pulling the downpipes and removing the pre-cats, then getting a pair os sportcats installed underneath the car where the original main cats were.
Having the cats mounted right against the turbo like that doesnt help the flow and spool times, whereas if they're exiting into a nice clean elbow then down into a cat under the car you'll get better flow, and therefore better response, and hopefully, more power.
Nez, it's only worth seeking opinions, if you're willing to take advice proffered. If you still decide to do what you've been adviced against, no need asking really!
One of the reasons most of the time, I tend to stay put, and observe from the sidelines.
I would get someone to look over that car that knows what they're doing.
Remapped or not its not a happy bunny.
Might be an airleak or a faulty sensor, but unless you have the kit to diagnose it yourself, you're best to take it somewhere that does know what they're upto, like MRC or Unit20.
Have you had any of the usual culprits replaced? Like the F Hose or throttle body boot or the Dump valves?
For the sake of the petrol it would cost to get you to Banbury, get an MRC remap.
Doug knows S4's inside out and he'll have no problem sorting it out. His custom remaps are £500 and you will not get a better power result for your money.
Erm, You unbolt the downpipes, batter lumps out the cats with a big chisel/screwdriver/hammer, clear out all the guts then bolt the back on...
Its certainly not £400's worth of time...
Not sure where you are in the country, but your probably nowhere near me.
Perhaps someone who lives in your neck of the woods can advise?
Well St Albans (where you wnet to do your exhaust) is Herts which is my neck of the woods. I found VAG-Tech very very helpfull. And they advertise on here
For the sake of the petrol it would cost to get you to Banbury, get an MRC remap.
Doug knows S4's inside out and he'll have no problem sorting it out. His custom remaps are £500 and you will not get a better power result for your money.
VAGtech Limited
Unit 2 Hillcroft Works
Stewkley Road
Soulbury
Nr. Leighton Buzzard
LU7 0DH
http://www.vagtech.co.uk/
I can only sing their praises after the diagnosis work carried out on my A4, I would happily use them again but the car simply hasn't needed attention outside of my ability (yet)
That's only the end of next week mate.
And I can vouch these guys know what they're doing and their labour rate was exceptionally reasonable
i got quoted £125 to remove my downpipes gut the precats relocate the sensors and check my remap settings to make the most of the mod which i thought was very good
keep an eye on the box welds ive seen them go very rusty within a few months on the powerflows apart from that looks pretty neat is it all one i dont see no joins?
couple of points...no1, flexi joints for exhausts can be bought for £25-£35 quid from demontweeks website and lots of others so they must pay peanuts for them and charging £200 is robbery i'd have walked away. no2, i got quoted £125 to remove my downpipes gut the precats relocate the sensors and check my remap settings to make the most of the mod which i thought was very good but defo wouldnt pay £400 you must wear a sign saying "take my pants down and give me it" lol
Nez,
Sounds like you have learnt a lesson with the remap. Get yourself to MRC to have any issues the car has sorted and what is most likely the best remap you'll get for the 2.7tt.
Lets hope the exhaust is at least not any more restrictive than the stock item.
I wouldn't remove S4 downpipes, gut pre-catalysts, weld new 02 sensor bosses, replace for less than £250.
It's an **** of a job at the best of times, unless it was being done for a buddy, in which case I'd do it for free. At £125 all in, by the time you're through, you'll be working for about £15 per hour, assuming everything goes well, and the turbo studs don't break.
I wouldn't remove S4 downpipes, gut pre-catalysts, weld new 02 sensor bosses, replace for less than £250.
It's an **** of a job at the best of times, unless it was being done for a buddy, in which case I'd do it for free. At £125 all in, by the time you're through, you'll be working for about £15 per hour, assuming everything goes well, and the turbo studs don't break.
my quote was from mark hardy(automark) from stokesley,north yorkshire the lad that did my custom remap and his reputation is second to none ,the best custom remaps in the north of england if not the whole country.
How much does he charge for the custom maps?
and compared to lots of videos i've seen of other remapped s4's accelerating its a couple of seconds quicker to 120
You do realise to accellerate "a couple of seconds quicker" to 120, you need a significant amount of extra power?
And given that the stock blowers are pretty much flat out at the 320hp you usually get from a normal remap, where exactly is this extra power coming from?
Rough numbers show that a stock S4 will do 0-100 in about 15 secs, with your average 320hp remapped car will do it in 12 secs.
To get another two seconds off that normal remap time you'd need about 380hp...
Its one thing saying the guy did a good job, but making up random numbers which make no sense whatsoever just makes it look silly.