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LCE Pro Flow Exhaust System

Old 09-18-2016, 07:26 PM
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LCE Pro Flow Exhaust System

Hello folks,
I took the plunge during the labor day weekend sale and purchase LCEs street header, cat, and pro flow 2.25" exhaust system. Install was a breeze, couldn't even believe that the header fit in there, the thing is a beautiful piece of work:



Torqued all flange connections to 32ft/lbs and all U-Bolt slipfit clamps to 20ft/lbs, at which point the brackets are deforming heavily. I was shooting for 30ft/lbs but they're not really gaining torque as I tighten the nuts because the brackets are bending/weakening.

Unfortunately 4 of these slipfit connections are leaking. This is my first time dealing with the slipfit/ubolt connections, and they seem like something that you'd want to weld, but I hesitant to ruin the immaculate ceramic coating.

I'd love the input of anyone with experience with these slip fit connections. I'd rather not weld them.

Let me know,
Thanks!
-Jackson
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Old 09-18-2016, 07:44 PM
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You are going to want to get the wider band stable clamps. I had the same issue with my Thorley headers on the 3.0. Since I put the longer band clamps on, no more leak. I agree, that is a beautiful set of pipes! The clamp you're going to want looks like this:
Attached Thumbnails LCE Pro Flow Exhaust System-image-3876356905.jpg  

Last edited by 91bluerunner; 09-18-2016 at 07:46 PM.
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Old 09-19-2016, 06:32 AM
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Originally Posted by 91bluerunner View Post
You are going to want to get the wider band stable clamps. I had the same issue with my Thorley headers on the 3.0. Since I put the longer band clamps on, no more leak. I agree, that is a beautiful set of pipes! The clamp you're going to want looks like this:
Yeah, that looks like it would do it. Do you use copper RTV with a clamp like this?

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Old 09-19-2016, 08:36 AM
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Originally Posted by sweitzerworks View Post
Yeah, that looks like it would do it. Do you use copper RTV with a clamp like this?
I've never use sealant on either a band clamp or a slip fit.

Also - in front of the 02 sensor - some sealants can screw up the 02 sensor
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Old 09-19-2016, 08:37 AM
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did you call up lce and ask 'em why it's leaking? see what they say.
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Old 09-19-2016, 08:51 AM
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I don't have any o2 sensors, so that's not a concern of mine. I did talk to LCE, they admitted that people occasionally have problems with getting a complete seal on the slip fits. They offered me store credit for whatever I end up purchasing to fix the leaks and are interested in the results of the band clamp over the slip fits.

I think I'm going to try them out with some copper RTV and report back.

LCE is hands down one of the best businesses I've ever worked with. The quality of their products is matched only by the comprehensiveness of their customer service.
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Old 09-19-2016, 11:06 AM
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I wouldn't put any kind of sealant on or in or under the clamps. Dry would be best.
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Old 09-19-2016, 12:08 PM
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Originally Posted by 91bluerunner View Post
I wouldn't put any kind of sealant on or in or under the clamps. Dry would be best.
Why do you think dry?
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Old 09-19-2016, 01:17 PM
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Whenever I've seen stuff like that with silicone or sealer (even high temp), it gets hard and crumbles away. Then that leaves a gap or channel for the air to start escaping again.

I would start off dry or if you really want wrap the edge of the slip pipe where the clamp goes with a single layer of header wrap then clamp over that. I've done that on a few extreme leak occasions and it works out if done right.
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Old 09-19-2016, 07:46 PM
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Awesome, thanks! I'll give it a shot dry first.
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Old 06-17-2019, 03:12 PM
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Hiss noise from exhaust

Hey guys Iím new to the yota scene I have a 93 toyota with LCE headers and LCE Pro flow exhaust. Every time I step on the gas it seems like thereís a hissing noise like air is escaping. Anyone mind helping me diagnose the problem or is it just something that is normal for the exhaust thanks !
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Old 06-17-2019, 03:37 PM
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What motor? I've had the lower back bolt (closest to the firewall) back out of my 22re twice now.
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Old 06-17-2019, 05:59 PM
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Originally Posted by jakey poo View Post
What motor? I've had the lower back bolt (closest to the firewall) back out of my 22re twice now.
When I first got my 22re 4runner, it was missing that lower back bolt as well, and I've heard of others having it back out. Seems common.

Last edited by 5 Fists; 06-17-2019 at 06:00 PM.
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Old 06-18-2019, 06:51 AM
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Headers are loud. Not out of the exhaust pipe. Sure you are hearing something weird? Video it.
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Old 06-18-2019, 06:56 AM
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Originally Posted by jakey poo View Post
What motor? I've had the lower back bolt (closest to the firewall) back out of my 22re twice now.
Itís a 22re long block but the hissing sound is coming from right behind the cab
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Old 06-20-2019, 05:19 AM
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My only gripe is the header paint starts to peel off within months.
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