Finished replacing the stock DP & precat with a $60 ebay stainless downpipe. Went for a drive and it ran MUCH stronger! Boost pattern with the clogged precat was 10-4-5 and is now 10-9-10. The car idles like crap now and was pulling 8-10 inHg at idle. Idle speed was ~500 RPM. After a few days, the idle smoothed out a bit and the car idles a little higher with 12-13 inHg. Still low on vacuum but the compression was over 100 PSI on all faces 500 miles ago when I bought the car.

I highly recommend the ebay downpipes as an alternative the $300 DPs. Fit was perfect and it looks nice. If it matters, I bought this one from ebay user alwaysbargains.

 

i was just looking at one of those. definitely going to get a down pipe after i get my rebuild stuff together. probably an ebay one.

how much was the rip off, err, i mean shipping on it? they always rape you on it.

 

are you running it on stock ecu with no problems? or do u have a pfc or sooomething

 

You can run a downpipe and catback on stock ecu with no problems, some people have run even more power mods and been alright. Stock ecu is tuned very rich....main thing to look out for is increased boost with stock ecu. It's very important to keep that main catalytic converter in place.

 

another thing i didn't know

 

Yeah, you can open up the exhaust as much as you want with the stock cat, its so damn restrictive lol it limits the boost using back pressure. Open up the cat, you get less back pressure, which means more boost.

 

$30 shipping which puts the cost at $90 to my door.

 

not bad at all, all the ones i saw on there were like 40-50 dollars shipping. actual cost at UPS store is like $20.

i'll check out that guys store when the time comes.

oh, and was it all stainless?

 

anyone have a stock cat i can buy? i need it shipped to japan by next month lol, i ned it for JCI, i dont have one

 

I bought the same thing (well, DP and Midpipe) from that exact seller a few months ago. I too had no problems at all with the product. My review here:

https://www.rx7club.com/forum/showthread.php?t=501197

 

PMed you.

 

Yes. Polished to a mirror finish. Looks and functions great.