1983 Toyota Celica GT-S - Message Forum (Catalytic Converter)

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Catalytic Converter

Posted By: Terry

Posted On: August 05, 2002 at 7:58 pm GMDT

I had a high-flow cat, 2 1/4 midpipe and OEM muffler installed in my 84 GTS. It sounds quiet and seems more powerful than stock, especially above 4,000 RPM. The shop that did the work will do my downpipe next.

Should I go 2 1/4 or 2 1/2 on the downpipe?

They will also build a cat bypass tube for me. It was noted by Steve that he would not 'recommend running a bypass tube on a 4-cylinder fulltime'. Does this imply that it is OK to run a bypass tube on an 8-cylinder? OR does this mean a catastrophic failure of some sort in the motor?(By OK I don't mean laws/regulations, as it is illegal to remove a catalytic converter except for off-road use, which I plan on doing as I autocross with the GTS).

TIA

Replys:

Re: Catalytic Converter - Steven Benner 08/06/02 (3)

Re: Catalytic Converter - terry 08/07/02 (2)

Re: Catalytic Converter - Steven Benner 08/08/02 (1)

Re: Catalytic Converter - CATCONVERTER ELIMINATOR 12/25/03 (0)

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Message:	Terry wrote: > I had a high-flow cat, 2 1/4 m > idpipe and OEM muffler install > ed in my 84 GTS. It sounds qu > iet and seems more powerful th > an stock, especially above 4,0 > 00 RPM. The shop that did the > work will do my downpipe next > . > > Should I go 2 1/4 or 2 1/2 on > the downpipe? > > They will also build a cat byp > ass tube for me. It was noted > by Steve that he would not 'r > ecommend running a bypass tube > on a 4-cylinder fulltime'. D > oes this imply that it is OK t > o run a bypass tube on an 8-cy > linder? OR does this mean a c > atastrophic failure of some so > rt in the motor?(By OK I don't > mean laws/regulations, as it > is illegal to remove a catalyt > ic converter except for off-ro > ad use, which I plan on doing > as I autocross with the GTS). > > TIA
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