is there anything i should replace or check with the stock down pipe off. 93 fd 5 speed.

 

yeah once its off replace it with a aftermarket downpipe. check the gasket for damage. replace studs and nuts if damaged during disassembly

 

you could also replace the o2 sensor. the gaskets usually hold up pretty well unless you damage them trying to remove the precat

 

get 3" downpipe. the car will spool faster and give you quicker response. don't spend a lot of money. there are good ones out there that are not name brand. Its just a metal pipe!

I agree with 4CN A1R, replace O2 sensor.

 

thanks guys. yeah ive got one,'aftermarket dp' thats why i took the downpipe off, im looking for a cheap 02 right now.

 

i have to say, hats off to you for atempting to take the precat off yourself. most of us just take ours to a shop cause of all the time and pain staking effort that goes into removing it

 

it kinda was a pain in the ***,i think my hands are too big. almost hired a latino midget to get that top left nut off.

 

cheap o2.. go to autozone, bosch universal.. $19

 

i did notice a hose about to come off some kinda valve behind the turbos, i couldnt get past the tube going to the midpipe with my hand , but i did push it back on all the way with a long flathead screwdriver.

 

Wrap the aftermarket pipe with header wrap and/or heat coat it before installation.

 

it was a airbypass valve'which the hose was coming off'. thanks 76 ,i just got one. And i was thinking about header wrap Sgtblue , is it worth it ?

 

Yes. In addition to aiding exhaust flow a little, it dramatically reduces underhood temps. If you've been running the stock pre-cat, it will be like going from the Sahara to the North Pole in terms of temps. Way better for underhood plastics, wiring, vac lines etc.

 

can i do a freeflow midpipe and exhaust and be ok without overboosting ?

 

Probably not.

 

But it's so fun At least it's easier than doing an FC's precat. When I had my FC I got discouraged with how much of a PITA it was being so I ran around town for a 3 weeks with just the precat on, I felt like I was driving a diesel. Hearing the turbine spool was a joy as well. Then I eventually had time to work on it again and got the precat off. The same happened with the FD except I only ran around for a week like that.

 

Read the definition of boost Creep in the stickys, and search for threads about the topic.

 

If you have the down pipe off, might as well take the turbos off, get the wastegate ported, then you can have the midpipe.

 

car is all stock except for downpipe,just installed. i do have the mid pipe and muffler-not on yet. i was wondering what elsei could do before i have to worry about boost creep or spike.i didnt know if i could do the complete exhaust without doing anything else yet, ie=cold intake or fmic.i plan on getting a power fc comander soon.

 

car is 93 touring with 78k on body,20k on motor. dp and turbo timer only bolt ons.i really didnt wana do wastegate until motor or turbos are finished. need dependable-longlasting bolt on horsepower, maybe half as much as my vette.

 

Porting the wastegate is a simple and effective means of controlling spike. With the downpipe off, you unbolt your turbos and, with the right tools, you can do it yourself. If you wait, your engine or turbos WILL go due to creep, and then you'll be out extra money. So much for dependable and long-lasting horsepower, right? And nevermind it being half your 'Vette; you could spend a lot more if you don't take precautionary measures with the rotary.

 

Use never sieze on the threads when re-assembling. Youn WILL take it off again someday and you'll pat yourself on the back for ding this install right


Later

 

since it was already jacked up and i could fit under the car, i got carried away and did the complete exhaust, from turbo to exit. i did stick a restrictor silencer in the exit hole! wish me luck. and i did a y pipe. GO Obama and Hillary !!! NOT ha ha

 

Anyone know how much RWHP gain you will get with JUST a 3 inch DP?

Just take a guess....

 

8hp

 

is it normal for the exhaust to smell bad and smoke after down pipe and mid pipe installed ? it didnt do either before.