View Full Version : quick exhaust question

10-01-2005, 12:08 PM
Alright i have a magnaflow muffler and I wanted a local muffler shop to make me a custom 2.5" catback but when got to the shop they told me that they could only do it from the flexpipe back because of the position of the cat. Is this right? they also said that 2.25" would be 80$ while 2.5" would be 120$. Now my question is that will i even be seeing any gains by going from the flexpipe back? and also is it worth it to go with the 2.5" even though its only from the flex back. thanks

10-01-2005, 01:01 PM
please someone comment on this, i need to get this exhaust on today.

10-01-2005, 01:48 PM
get the 2.5" from the flexpipe back. The flexpipe helps take out some of the engine vibration anyways. The restriction in the system is really the cat so anything from the cat back isn't really going to help much w/ a k03.

10-01-2005, 01:51 PM
so bitter, if i get a 2.5" from the flexpipe back, then i will have to get a testpipe and downpipe to make it a complete stystem?

Also for the people who have custom systems, do you also have the shop run the piping from the flexpipe back or is this shop just bs me?

10-01-2005, 01:52 PM

10-01-2005, 02:20 PM
thank you for responding bitter, but my last question is that is it normal for a shop to say that they cant make the piping from the cat back, only from the flexpipe back?

10-01-2005, 02:35 PM
i asked a very reputable shop for a price quote. they quoted me around 800 bones for a 2.5 system not including the downpipe because it is so 'complex'. it would be 1200 including the downpipe. i would just buy a downpipe from somewhere and put it in.

10-02-2005, 03:34 PM
for $1200 you can get a milltek or apr and buy a downpipe

10-04-2005, 09:16 PM
i just got my exhaust put on and during the install i had to go to the bathroom so when i came back the shop had cut the piping from the flexpipe back, now my question is should i have asked them to just undo the ping from the joint near the flexpipe or is it ok that they cut it. I ask this because i am planning on putting the stock exhaust on in the future.

10-04-2005, 09:23 PM
anything they can cut, they can weld. Does that answer your question?

10-04-2005, 09:26 PM
When removing the stock exhaust the only joint is between the cat and downpipe. If you want it seperated somewhere else you have to cut it.

10-04-2005, 10:26 PM
mabe its lke that for your s4 but the 1.8t has a joint held by two nuts right before the flex joint. But yea thanks for the info Bitter.

10-05-2005, 02:49 AM
Well the s4 system is totally different...the cats are after the downpipes and there are 2 of them.

The complete system on my 98 1.8t was welded from the flange that bolted to the cat back to the end of the exhaust tip. I removed it in one piece and installed it to years later in one piece. There was no where to unbolt any of it in the middle.