Pros and Cons of Goodwin Midpipe

[Serpico]

any and all appreciated!!!!

[socal pat]

I like the fact that it has the fittings for your 02 sensor and even one for future EGT or WB sender. Mine fit right in with no issues, but you might have to do some digging in the packing material to find the gaskets that you'll swear they forgot. :oops: There is a spot where I get a hollow drone, but it happens only in a narrow RPM range. At cruise It's pretty much invisible.

[Dr Evol]

The pipe fits perfectly, looks great and sounds good. Just a little more throatier sound that is not intrusive. Barely audiable at speed.

[Tom @ Fast Forward]

Not sure but I think it is what I have. I ordered it from Brian and RB delivered it. If so, I love it. With my stock muffler, it is very stealthy. Dead quiet at my nrmal cruis speeds. Did I mention 100MPH is only 4500RPM? :)

[Kyp J]

I just got my rebuilt engine in and a new Goodwin midpipe with the oldest version of the roadster sport muffler. Louder, but I like it. It at least sounds fast. I'm staying out of boost for awhile. Don't need stealth since nobody thinks old geezers go fast anyway. My brain is still only 18 years old.

The pipe hits the frame at the tail section where it goes past the rear suspension. I put a hose clamp on the donut to pull it tighter and it has enough clearance that it only bangs when the new clutch jerks off in first.

Anybody doing it in the future, put in the secondary O2 before putting it in place. Hard to get to but possible when installed.

[elerner]

I like the fact that it has the fittings for your 02 sensor and even one for future EGT or WB sender.

I didn't see my Goodwin Midpipe before I had it installed. Is there a bung for an O2 sensor in the front? I didn't think so. I know it has a bung for an EGT right at the CAT (I know 'cause the plug loosened up on me and fell out, boy that was loud). I recall reading that using the EGT bung for a wideband O2 sensor wasn't a good idea. Truth or fiction? If I fit a wideband O2 sensor in the future I figured I'd have to have someone drop the midpipe and weld in a bung.

[Kyp J]

The primary O2 goes in the short section after the header and before the midpipe.

I used the bung part way between the Cat and resonator for the second O2. It has a bung right at the back of the CAT with a plug. I guess I should check it for being tight. I didn't check the bottom plug of the new radiator either and it leaked a little under pressure.

I assume you don't want the wideband after the CAT since that changes the readings somewhat.

I had a bung for the wideband put in right past the flange before the CAT and since I had one put in the stock midpipe and knew it to be a little off, I had this one put a little more to the side. Naturally I went the wrong way and now the wideband is even closer to the transmission. It is OK but the wires have to make a sharp bend. It would be about right to have the bung straight up with the CAT flat side horizontal. The flange is at an angle.

[Tom @ Fast Forward]

EGT, if your were going to add one, would go as close to the exhaust manifold as possible. It cools rapidly and you want to see the real numbers. Wideband O2 should go close to but before the cat. I stuck mine also after the flange but before the cat. It should be as far from the exhaust manifold as possible but before the cat to keep it somewhat cool. After the cat can be 0.2 to 0.5 leaner than before the cat. Because of that, be somewhat careful when you read posts that suggest 12.5:1 A/F as they are typically post cat. If you tune for 12.5:1 pre-cat, you could actually be as lean as 13:1 and that is pretty lean.

I believe DynoJet recommends no leaner than 12:1 for turbos and superchargers and that is post cat.