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On the 18, I went in from underneath after removing the belly pan. Time consuming, but very easy.

Just a note of thanks for sticking w/this thread and providing your advice--your insights were very useful. Cheers, Mike

Final note (for now), I have some follow up here: https://www.mustang6g.com/forums/threads/light-intermittent-thunking-sound-after-tsp-header-install.119271/#post-2502675

We went over the entire installation and found no other points of contact other than that described in the posts above. Not sure it was the wisest fix, but we simply pushed the A/C line away from that top pipe, which was the source of the dull, metallic clatter I was hearing in the cabin. Put...

I'll have it on the lift tomorrow...apologize for that pic--it is hard to tell w/o looking from underneath, but it appears dropping the motor down roughly 1/2" might clear that A/C line. Otherwise, I'm wondering about somehow tweaking the line a bit...not sure how, yet, but I would think even a...

I'll have to find someone who can do this--the shop who installed the headers expressed doubts that this is possible. But, they're "quality checking" the installation tomorrow...so, we'll see.

There's contact here: https://photos.app.goo.gl/axZg3i44BRnzLBCLA Ref: https://www.mustang6g.com/forums/threads/light-intermittent-thunking-sound-after-tsp-header-install.119271/#post-2499934

Hoping to get the car up on a lift this week to double check the entire installation. However, there is contact here: As I've mentioned, I'm know enough to be stupid about cars--particularly a problem like this. However, I'm wondering if 1) that line can be relocated/reconfigured/replaced or...

Yah, it's definitely not the headers--which are not making contact. Still, I swear I've heard this sound from other mustang guys, but I just can't place it. It almost sounds like a loose lid on a boiling pot--probably a bad analogy.

I had a second and third set of eyes on the TSP headers, and all agreed that, despite the proximity, the headers are not (at the moment) making contact w/the frame (or the AC line). So, for the moment, I'm ruling out the source of an odd and interment sound that presented itself directly after...

At idle: Cruising: This sound seems to emanate from the engine bay (2018 Mustang GT), but I can't tell. It first occurred on the very first start up after the installation of a set of Texas Speed headers. Confirmed this afternoon that, despite the next-to-zero clearance on the passenger side...

As I mentioned, I'm no expert and have yet to determine what contact is being made; however, I've heard from a number of people, all of whom seem to be divided on the possibility and prudence of shifting the motor. Honestly, I don't know enough to know how that works (meaning, the actual...

Not sure if this link will work, but a quick shot from the top down shows a possible point of contact. I'm on the road, so uploading pics isn't possible at the moment. Again, I'll have a better idea tomorrow. https://photos.app.goo.gl/5dYURTtc1PMWXSHb9

I'll have a better idea tomorrow, when the car goes up on the lift. I take it you had a similar issue prior to shifting the motor (how far over?). I know just enough about cars to be stupid, but once we find out where contact is being made, I'd be interested (and grateful) for viable solutions...

I had my TSP (25-TSP50178H-CON-CAT) installed recently and I am getting an intermittent but persistent (very) light thunking sound, which I believe is coming from the passenger side. Shop owner said right away that the tubes are more than likely knocking up against something--but can easily be...

As it turns out, I'm going to Voodoo on Monday for the installation.

I'll look...but I didn't note any trouble with the fit...haven't noticed any issues since the install...but now I'm kinda nervous...so, again, thanks for the interest. Follow up: everything is flush.

Thanks for your interest and concern. Spacers were used, so the studs may--perhaps, it seems, likely--have been trimmed/resized in advance.

Nope, spacers were plug & play.

Ford Performance Springs (M-5300-X) on Stock GT PP wheels/tires with 20mm spacers on front and 25mm spacers on rear. Approx ~1" drop all around.