Exhaust Question
Thread Starter
New Member
Joined: Jan 2004
Posts: 67
Likes: 0
Exhaust Question
I just want to confirm...
As i have a chipped audi a4 1.8T quuattro and i will be getting a FMIC aswell.. will it be best for me to get a 3 inch exhaust system (turbo back of course) orrrr a 2.5 inch system??
I've heard good and bad things about both and i just want to know straight out which one would be best for my car!
So far i have decided to go turbo dump pipe, high flow cat (with fire ring) all mandrel bent in mild steel and custom stainless steel mufflers but i havent decided what size piping is best yet... any advice would be appreciated.
cheers guys
As i have a chipped audi a4 1.8T quuattro and i will be getting a FMIC aswell.. will it be best for me to get a 3 inch exhaust system (turbo back of course) orrrr a 2.5 inch system??
I've heard good and bad things about both and i just want to know straight out which one would be best for my car!
So far i have decided to go turbo dump pipe, high flow cat (with fire ring) all mandrel bent in mild steel and custom stainless steel mufflers but i havent decided what size piping is best yet... any advice would be appreciated.
cheers guys
AudiWorld Senior Member
Joined: Apr 2002
Posts: 1,421
Likes: 0
DEFINATELY 3" - I had a 2.5" system - and just had it ripped out for for a 3" system
And make sure you **** off the stock cat and get a hi flo unit under the car. The stock Cat is a cork.
3" is a BIG improvment of 2.5" - I can say this as I have actually now had both.
3" is a BIG improvment of 2.5" - I can say this as I have actually now had both.
Thread Starter
New Member
Joined: Jan 2004
Posts: 67
Likes: 0
Re: DEFINATELY 3" - I had a 2.5" system - and just had it ripped out for for a 3" system
oh cheers man! at last somone can give me a straight answer! with some proof that they know what the difference is 
AudiWorld Senior Member
Joined: Apr 2002
Posts: 1,421
Likes: 0
Just further to this:
I had a CAT back 2.5" system for about a year - it was good (much better than stock) - but the real improvement in throttle response and top end came from changing over to turbo back and 3" with a hi flo cat under the car.
My advice: Dont waste your money like I did- do it properly the first time and get 3".
My advice: Dont waste your money like I did- do it properly the first time and get 3".
AudiWorld Senior Member
Joined: Apr 2002
Posts: 1,421
Likes: 0
He wont need a ECU remap unless his car is DBW
Even then he doesnt need an ECU re-map.
his worst case scenario if he is Drive By wire (like ur RS4) is that his computer will throw a CEL error. But given NONE of the B5 A4's are DBW in Australia - its not an issue.
his worst case scenario if he is Drive By wire (like ur RS4) is that his computer will throw a CEL error. But given NONE of the B5 A4's are DBW in Australia - its not an issue.
AudiWorld Senior Member
Joined: Apr 2001
Posts: 1,861
Likes: 0
What ! are you crazy
of course he'll need a remap. His WOT works off a fixed map. DBW or NonDBW.
on my 01 A4 TQ (180hp), i installed a Milltek Downpipe (along with the exhuast). I had to uninstall it, as it dropped hp and ran lean at WOT. I was lucky enough to dyno before and after every mod.
You dont need a remmapif your doing the middle and rear exhaust, as the flow rate change is within the spec, but as soon as you change the DP, and especially if you de-cat, screwed, remap needed. Else, major engine damage awaiting, not to mention marginal peformance.
Better he learns now. But then you ask the hard question, who can remap in AU. Start with Lucus and his GIAC relationship.
on my 01 A4 TQ (180hp), i installed a Milltek Downpipe (along with the exhuast). I had to uninstall it, as it dropped hp and ran lean at WOT. I was lucky enough to dyno before and after every mod.
You dont need a remmapif your doing the middle and rear exhaust, as the flow rate change is within the spec, but as soon as you change the DP, and especially if you de-cat, screwed, remap needed. Else, major engine damage awaiting, not to mention marginal peformance.
Better he learns now. But then you ask the hard question, who can remap in AU. Start with Lucus and his GIAC relationship.
Trending Topics
AudiWorld Senior Member
Joined: Apr 2002
Posts: 1,421
Likes: 0
Do you have any clue at all?
Air / Fuel is determined by the Mass air flow meter detecting the amount of air coming into the engine, which the ECU reads and adds the correct amount of fuel.
Tell me this? How are all the Audi's running around with after market exhausts not pinging? Because I can tell you they all certainly dont have remapped ECU's.
And why does my own car register a perfect air/ful curve on the dyno? I havent had my ECU remapped for my exhaust!
Its this sort of BS that causes problems and puts uncertainty in peoples minds - just do a search on exhausts and that will confirm what I have told you.
Tell me this? How are all the Audi's running around with after market exhausts not pinging? Because I can tell you they all certainly dont have remapped ECU's.
And why does my own car register a perfect air/ful curve on the dyno? I havent had my ECU remapped for my exhaust!
Its this sort of BS that causes problems and puts uncertainty in peoples minds - just do a search on exhausts and that will confirm what I have told you.
AudiWorld Stories
Bringing Audi to Life for Audi Fans
10 Strangest Audi Designs That Actually Made Production
Joe Kucinski
2027 Audi Q7 and SQ7: Audi Upgraded EVERYTHING!
Michael S. Palmer
Audi Unveils Absurdly Cool New Supercar: 10 Things You Need to Know!
Verdad Gallardo
The Highs & Lows of Every Audi C-Class Generation
Joe Kucinski
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
AudiWorld Senior Member
Joined: Mar 2000
Posts: 1,173
Likes: 0
Re: What ! are you crazy
Well depends on chip to start with.
But with our chips we have never needed to remap for exhaust.
This all comes down to how many modification are actually done to the chip to start with.
Some chips on market have very minimal parameter changes just to give you some more power.
Some chips have a lot of work don to them and are virtually a re-write of the code.
But with our chips we have never needed to remap for exhaust.
This all comes down to how many modification are actually done to the chip to start with.
Some chips on market have very minimal parameter changes just to give you some more power.
Some chips have a lot of work don to them and are virtually a re-write of the code.
Thread Starter
New Member
Joined: Jan 2004
Posts: 67
Likes: 0
Re: HAHAHA oh my god!
what the hell should i do now....
split decision and i dont have a clue whos right hahaha
Maybe i should just call audi here in perth they might be able to tell me whether i will need an ECU re map. Although none of the exhaust places (even the one who does the exhausts for audi here in perth) have said anything about re-mappinbg me ECU....
so what do i do now?
split decision and i dont have a clue whos right hahaha
Maybe i should just call audi here in perth they might be able to tell me whether i will need an ECU re map. Although none of the exhaust places (even the one who does the exhausts for audi here in perth) have said anything about re-mappinbg me ECU....
so what do i do now?