If you haven't received the headers, I wouldn't do Stillen headers for sure. They also do not fit properly, are an absolutely bear to install, the 02's are very difficult to remove w/o killing the threads and the headers only produce 2-3 additional hp.

Let's put it this way....... If I knew then what I know now, I'd personally not do it again. The additional $800.00 for new 02's didn't help the cause.

Dan at Out Performance Shop ( Out-Perform with OUTPERFORMANCE SHOP - Your one stop auto shop for performance parts, accessories, installations, and more ) is working on some true long tube headers for the 370. He has my stock manifolds and I've seen pictures of his prototype. Give him a buzz if you haven't purchased yet as these may actually produce real gains.

If you absolutely must have the Stillens.....mine will be for sale shortly at probably a substantial discount.

Mine went on last night. Have not heard back from the mechanic yet. He said it was a going to be a tuff project and that my stillen CBE was a terrible fit for my car. Its to bad because the car runs very well and makes good power with all the exhaust modifications.
Next trip is tto the exhaust specialist . to have the pipes bent so that everything lines up and does not hit the cross brace.

I wish I had read this prior to buying. I like the sound of the pipes but had what sounds like the same clearance issue. There is a cross member right behind where the front Y pipe connects to the center section. There was nearly no clearance there when all the bolts were tightened. My assumption at that point was that perhaps that cross member was unique to the Roadster since it has no roof to stabilize the body but from what I'm reading here it sounds like the exact same problem. I may be wrong though since I haven't seen the underside of the coupe. Most compelling though is that the guy that owns the muffler shop where my brother works (and where I had my brother install the catback) suggested putting washers under the cross frame bolts as a quick fix until I could come back and have the pipes bent a bit. From that I think we are talking about the same darn cross member. If so, what a disappointment.

where did you order it from? i know there was a batch sent out with fitment issues from the start but has been corrected since, I bought mine directly from Stillen.

I bought directly from Stillen as well, about three weeks ago. I guess it is probably an easy thing to fix.

There are some pics in my gallery of the piped and cross member. Does this look like the issue you had? Nissan 370Z Forum - Zfish's Album: Zfish's Album

oh that thing, yeah mine hits that as well, determined thats the cause of alot of the vibration i hear, I would assume that pulling the cross member off, hammering the middle in a bit and re installing should allow some clearance.

My brother and I think that shimming the cross member bolts with some washers would probably fix the problem. I'm not quite ready to break out the hammer yet. :)

I installed mine yesterday and had the clearance issue. I had to leave the cross member off, any updates with your issue?

I wound up pulling the Y pipe back out, heating the front part just behind the flange, and flattening it with a peen. This gave about a pinkie's worth of clearance and solved the problem. It's been sounding sweet ever since. I had the advantage of doing this with my brother who works at a muffler shop though.