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This might be an incredibly stupid question, but WTH, I've never let that stop me before. I have a sandblasting cabinet in my garage for my job. Would it be workable or advisable to just stick the manifold in the cabinet and blast the remaining pre-cat media out with glass bead? Glass bead would not harm the interior (I think?) and would throughly remove every iota of pre-cat material. Then a high pressure air blast to clean. What say the sages?
Yeah, that would work.
It's somewhat extreme, however.
 

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This might be an incredibly stupid question, but WTH, I've never let that stop me before. I have a sandblasting cabinet in my garage for my job. Would it be workable or advisable to just stick the manifold in the cabinet and blast the remaining pre-cat media out with glass bead? Glass bead would not harm the interior (I think?) and would throughly remove every iota of pre-cat material. Then a high pressure air blast to clean. What say the sages?
The manifold should come out looking beautiful. If yours comes out nice, maybe I'll get mine sandblasted too. Please post photos.
 

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The manifold should come out looking beautiful. If yours comes out nice, maybe I'll get mine sandblasted too. Please post photos.

Will do, if I go that route. If you try this, be sure to blast with glass bead or something softer. Lots of places regularly use aluminum oxide or iron ore, and I'm sure that would not be good for it...
 

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200 MR2 precat

we are about to pick up our "fun car" , 2000 green spyder with 45K miles. been reading about the precats problem and wondered if anyone has just replaced the factory with the magnaflow product and what if any is the difference/hazards/benefits??
 

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I believe he's talking about this header with integrated precats made by Magnaflow. I don't know if anyone has ever actually bought these since gutting the precats is a much more economical solution and even in California you'd most likely still pass emissions just fine.
 

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Hi all
I know I'm going to get shot down with this but I need to ask! I'd appreciate answers from those who have actually gutted their precats.

So my 3 amigo's loosened relatively easily after soaking and heating.
My top shield bolts are rusted and stuck fast. The heads are very shallow and even my six sided socket is just slipping off them.
The only way I can see them coming off is by doing something extreme like welding an old socket to them or something like that and I don'y even know what state the manifold studs are in yet.

However (here's the stupid question) has anybody considered gutting the precats with the manifold still attached to the engine. If i remove the main cat I'll have clear access to the openings on the bottom of the manifold. There is still room albeit restricted to attack them through the o2 sensor holes and pretty much unrestricted access from the bottom.
I have one of those snake inspection cameras so should be relatively easy to check all the cat material has been removed.
I'm thinking i can still flush it out with a moderate flow of water through the o2 sensor holes.

So is this likely to work?
 
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