Does the OBX Catback Drone? - Page 4 - ZR-1 Net Registry Forums

RichS · 07-13-2020

I welded mine together since the clamps sucked.

XfireZ51 · 07-13-2020

Quote:

Originally Posted by RichS

I welded mine together since the clamps sucked.

Really the only way to keep them from twisting and loosening up.
Especially if you?re putting out significant power over stock.

Black Red '90 · 07-13-2020

I bought Dynomax lap joint clamps. Haven't had time to install yet.

XfireZ51 · 07-13-2020

I used these clamps. The problem is they stretch over time and tend to allow pipe to twist. Mine are spot welded.

Paul Workman · 07-20-2020

Quote:

Originally Posted by RichS

I welded mine together since the clamps sucked.

Yes, they DO (suck)!

Black Red '90 · 08-01-2020

Finely got the car out for a drive after installing the exhaust. It's been a little delay since I needed an alignment done (rear lowering bolts installed same time as exhaust). I'm very happy with the results!

As others mentioned, it took a little work to get the OBX to fit properly. The post resonator hangers needed a single washer on each side to give a tad more clearance. The drivers side muffler was a different story. The tips were almost touching the bumper while the passenger side had a 5/8" gap. I ending up using 1/2" poly bushing between the body of the car and the factory mount. New bolts were needed as the factory ones weren't long enough. Worked great in the end. The tips are centered, level, and equal height side-to-side. Unfortunately, I was only able to use 3 of the 7 lap joint clamps that I bought. There simply wasn't room to allow for lap joint clamps on either end of the resonator section.

I couldn't find any videos of ZR-1's with just the OBX/Maximizer exhaust (no headers) at high RPM or full throttle. So I wasn't sure what to expect. Would the OBX be loud like the Corsa systems over 40% throttle?....NO. The exhaust has a subdued baritone sound whether cruising around town or WOT near redline. I would rate the factory exhaust 1.5 out of 10 for volume. The OBX I would rate 4 out of 10. You know it's there, but you won't upset your neighbors or draw unwanted attention when driving spiritedly.

Ccmano · 08-02-2020

Pair the OBX exhaust to OBX headers and it becomes more like a 7 out if 10. Low rumble at idle, quiet enough at cruise to carry a conversation but still noticeable and loud/borderline obnoxious at full throttle. With the exception of the exhaust system to header/cat connections mine is completely welded up.
H

07-13-2020	#31
RichS Join Date: Nov 2013 Location: Wilkes-Barre, PA Posts: 148	Re: Does the OBX Catback Drone? I welded mine together since the clamps sucked. __________________ 1994 ZR-1 #198, sold [img]https://live.staticflickr.com/65535/48400173802_2a6f122cfb_n.jpg[/IMG] [COLOR=RoyalBlue]96 GrandSport#857[/COLOR],[COLOR=Red]Red Gut[/COLOR] 397 LT4, AFR heads,3:90 gears, DRM longtubes, Sepanek 700R4, Yank 3600, bla-bla... Best ET w/396 & 6-speed 11.02 @126.57 w/1.60 60' Best ET w/396 & 700r4 10.82 @124.87 w/1.48 60' 2003 DarkShadowGray Ford Lightning 460rwhp/550rwtq 12.11 @112.18 w/1.71 60'

07-13-2020	#33
Black Red '90 Join Date: May 2018 Location: Virginia Posts: 79	Re: Does the OBX Catback Drone? I bought Dynomax lap joint clamps. Haven't had time to install yet.

07-13-2020	#34
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,704	Re: Does the OBX Catback Drone? I used these clamps. The problem is they stretch over time and tend to allow pipe to twist. Mine are spot welded. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

08-01-2020	#36
Black Red '90 Join Date: May 2018 Location: Virginia Posts: 79	Re: Does the OBX Catback Drone? Finely got the car out for a drive after installing the exhaust. It's been a little delay since I needed an alignment done (rear lowering bolts installed same time as exhaust). I'm very happy with the results! As others mentioned, it took a little work to get the OBX to fit properly. The post resonator hangers needed a single washer on each side to give a tad more clearance. The drivers side muffler was a different story. The tips were almost touching the bumper while the passenger side had a 5/8" gap. I ending up using 1/2" poly bushing between the body of the car and the factory mount. New bolts were needed as the factory ones weren't long enough. Worked great in the end. The tips are centered, level, and equal height side-to-side. Unfortunately, I was only able to use 3 of the 7 lap joint clamps that I bought. There simply wasn't room to allow for lap joint clamps on either end of the resonator section. I couldn't find any videos of ZR-1's with just the OBX/Maximizer exhaust (no headers) at high RPM or full throttle. So I wasn't sure what to expect. Would the OBX be loud like the Corsa systems over 40% throttle?....NO. The exhaust has a subdued baritone sound whether cruising around town or WOT near redline. I would rate the factory exhaust 1.5 out of 10 for volume. The OBX I would rate 4 out of 10. You know it's there, but you won't upset your neighbors or draw unwanted attention when driving spiritedly.

08-02-2020	#37
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Does the OBX Catback Drone? Pair the OBX exhaust to OBX headers and it becomes more like a 7 out if 10. Low rumble at idle, quiet enough at cruise to carry a conversation but still noticeable and loud/borderline obnoxious at full throttle. With the exception of the exhaust system to header/cat connections mine is completely welded up. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.