Exhaust Installation Problem on 240sx

[edmond]

I got a new catback system from ebay for my 92 240sx and when I tried to put it on, I found the diameter of the pipe is bigger than the pipe from the catalyst converter. So what should I do now? Should I take out the catalst converter and buy another "test pipe" and use it as an adapter to put the new catback on my car? Please give me some opinions.

[driftingmy240sx]

are the end flanges and gaskets going to mate properly? if it appears they will go ahead and bolt up you new exhaust system.

its normal for a new aftermarket cat back to be larger diameter than the stock.

[edmond]

No. They don't match at all as the size of the new exhaust is bigger, the flange, the bolt size are all bigger. So I have to do something on my catalyst converter otherwise there is no way to put it on.

I look at my maintenance manual but it doesn't mention what is the stock size of a Nissan exhaust. Is it 2.5" ? If I am going to buy a test pipe to replace my catalyst converter, shoult it be 2.5" in one end and 3" in the other end? I am pretty sure that the O.D. of my new exhause is 3".

[driftingmy240sx]

outside diameter doesnt matter. the i.d. does. i beleive the id on all 240's is 2 1/2" you should be able to use a 3" test pipe. is it possible you bought some cheap china knock off exhaust. if so that may be the proplem not the converter.

[edmond]

Good question. I have no clue where it is from. But I called the buyer and it is obivous that he speaks chinese English. The buyer also sent me two pictures with the pipes installed on a car. Obviously, this car doesn't have any catalyst converter. Anyway, what could be the problem of a "China knocked off" exhause?

BTW, how can I post a picture on m post ??

[driftingmy240sx]

i dont know how to post a picture i just use a photobucket link. do you know what brand exhaust it is, is it used, was it for a sr20 by any chance(it should still work though)

[edmond]

This is what he showed to me. Obviously, he put a test pipe instead of a catalytic converter.