Test pipes aka secondary cat delete pipes

[j_fields1357]

Has anyone ever thought of deleting or gutting the primary cats?

 

[edizzle89]

The primary cats are part of the exhaust manifold, they cant be deleted without welding a pipe in its place to the exhaust manifold which isnt a problem, just more difficult, i havent looked at them real close but you might be able to gut them with them still on the car if you're careful. You would also need a tune to delete the rear o2 sensors otherwise you'll get a fault.

 

[Flarfignewton]

I've toyed with the thought of putting high flow cats in place of the stock ones but I probably won't unless mine go bad.

 

[inmanlanier]

Are your pipes still available?

Sorry for the late reply and apologies if I did not respond. They are still available.

 

[inmanlanier]

Are your pipes still available?

Sorry if I did not reply before and the late response. Yes they are still available.

 

[edizzle89]

Sorry if I did not reply before and the late response. Yes they are still available.

I'll but the pipes if any of the buyers in front of me dont buy them

 

[inmanlanier]

please contact me at your convenience - 561 694-6924.

 

[kaigoss69]

Sorry for the stupid question...but how do you "gut" the secondary cats and is it virtually the same thing as fitting test-pipes (which as far as I can tell are not available right now?). This is for 2nd Gen 5.0. Second question, how does it change the sound and has anyone dyno'd any improvements?

 

[NSXNEXT]

1) remove catalytic converter
2) using a hammer and chisel or big flat-bladed screwdriver hit the catalyst inside the converter. It should break pretty easily.
3) be sure to remove all the broken piece
4) reinstall catalytic converter

 

[inmanlanier]

You will get a little more sound (not a whole lot). I'd be amazed if the increase in power/torque is measured to be any more than variations from pull to pull on a dyno. Likely less than 5 ft. lbs. torque/HP. This is an educated guess, not based on testing this car.

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[socal50rspec]

You will get a little more sound (not a whole lot). I'd be amazed if the increase in power/torque is measured to be any more than variations from pull to pull on a dyno. Likely less than 5 ft. lbs. torque/HP. This is an educated guess, not based on testing this car.

I've had my intake and magnaflow catback for over a year, someone posted dyno results on youtube showing a 10-15 hp increase, I can say that after installing the test pipes a couple weeks ago, I do notice even more improvement in midrange torque and a definite better throttle response and my mpg is even better with the less restriction.

 

[kaigoss69]

Thanks for the info. I'm still not sure I want to gut the cats on my 2nd Gen 5.0, I'd rather install test pipes. I think I'm SOOL as I can't find them anywhere, and it seems they would have to be custom-made by an exhaust shop. Ist that correct or did I miss anything???

 

[socal50rspec]

I haven't been under a second-generation Genesis to see if the exhaust is different. The test pipes I have aren't even advertised for the 5.0 yet, they are a perfect fit. Might want to just take your car to an exhaust shop and have them made, probably won't cost much more than buying a set.

 

[G-510323]

I wouldn't recommend 'gutting' the 2ndary cats. It's a PIA & that sh*t inside is lethal. You have to make sure every bit of it is removed. I replaced my 2ndary cats w/test pipes... and WOW, what a difference!! Better throttle response, better mid-range torque. Best $140 I've sent so far.

 

[NSXNEXT]

I wouldn't recommend 'gutting' the 2ndary cats. It's a PIA & that sh*t inside is lethal. You have to make sure every bit of it is removed. I replaced my 2ndary cats w/test pipes... and WOW, what a difference!! Better throttle response, better mid-range torque. Best $140 I've sent so far.

Do you have any other mods?

 

[G-191549]

And just for curious sake.... Where can you buy these test pipes for the 2012 3.8L v-6 sedan?

 

[G-896285]

If someone sends me a message, I have a set of pipes available. They came off my 2011, don't fit on the 2015 I now drive.

Do you still have test pipes?
csanderson2008@yahoo.com

 

[kaigoss69]

Are there any test pipes available now for the 5.0 2G?

 

[inmanlanier]

G-896285 - no - my test pipes were sold some time ago.
kaigoss69 - test pipes for this generation (I don't have my 1st gen anymore, now have the 2nd gen) are likely not going to be made (IMHO). The 1st gen cars had the secondary Cats bolted in on both sides, so a replacement piece of tubing with flanges of fixed length was easy to make. Our 2nd gen cars now have the cat welded on the inlet side (I think the outlet side is flanged - can't remember). The only way to do a test pipe would be to sell with the flange on one end, and an inlet pipe of geometry and diameter that it could be clamped in place (a longer segment of slightly larger diameter). The downside would be that if you ever would wish to put the original cats back in, you'd need a tube that could go over both sides of the joint with 2 clamps, or re-weld the cat inlet tubing back in place.

 

[Scamp]

G-896285 - no - my test pipes were sold some time ago.
kaigoss69 - test pipes for this generation (I don't have my 1st gen anymore, now have the 2nd gen) are likely not going to be made (IMHO). The 1st gen cars had the secondary Cats bolted in on both sides, so a replacement piece of tubing with flanges of fixed length was easy to make. Our 2nd gen cars now have the cat welded on the inlet side (I think the outlet side is flanged - can't remember). The only way to do a test pipe would be to sell with the flange on one end, and an inlet pipe of geometry and diameter that it could be clamped in place (a longer segment of slightly larger diameter). The downside would be that if you ever would wish to put the original cats back in, you'd need a tube that could go over both sides of the joint with 2 clamps, or re-weld the cat inlet tubing back in place.

What about having a shop cut the pipe where those secondary cats begin, weld a flange to the cat and the existing pipe so they can be bolted back on together (if you want to go back to using the cats for emissions or if its just too noisy), and then having them use a short test pipe with a flange on both ends?