From HFC to test pipes

[Eighties Meta]

Since next dyno will be adding additional parts along with going from HFC to test pipes does anyone know on average the hp/tq gain from hfc to test pipes? I assume fairly small?

Thanks
Kevron

Sent from my GT-N8013 using Tapatalk 2

[roy'sz]

I think you loose a little tq but gain in hp. That was the decision on my build.

[1cleanZ]

Originally Posted by roy'sz

I think you loose a little tq but gain in hp. That was the decision on my build.

Do we know this for sure? This literally is the Q & A I'm looking for.

Trying to decide between Resonated TPs or Resonated HFCs

[roy'sz]

ARK test pipes up to 10hp and 9tq, up to 9hp and 12tq on resonated hfc's.

[1cleanZ]

Originally Posted by roy'sz

ARK test pipes up to 10hp and 9tq, up to 9hp and 12tq on resonated hfc's.

hmm....That's interesting. I'm curious what differences it would make with say a Gen3 intake, giving it more breathing mods.

TPs, being more wide open, I would think it would gain more HP then just 1 doing TPs over HFCs?

Any other thoughts/dynos/results around this? My setup will be fully Fast Intentions, which my build date is coming up soon.

[roy'sz]

I would say my gain is about 30hp after hfc's, catback, gen 3's and m370 manifold. I have similar exhaust as what you are getting

You get more hp with test pipes but more tq with hfc's because of the slight restriction in flow.

[Leuz]

Around +25whp with my setup. See signature.

[1cleanZ]

Dang it, you guys definitely aren't making the decision any easier....

Even looking at the dyno charts, I might stick w/ my order of RHFCs and just do a non-resonated catback. The only hesitation on my decision was trying to get as much power as I possibly can NA. I almost feel like the TQ #'s would be more usuable power throughout the powerban. Hmmm....

Fast Intentions Resonated HFCS paired with a NONresonated Xpipe
or
Fast Intentions Resonated TPs paired with an 18" resonator in the Xpipe

[BOLIO 671]

Originally Posted by 1cleanZ

Dang it, you guys definitely aren't making the decision any easier....

Even looking at the dyno charts, I might stick w/ my order of RHFCs and just do a non-resonated catback. The only hesitation on my decision was trying to get as much power as I possibly can NA. I almost feel like the TQ #'s would be more usuable power throughout the powerban. Hmmm....

Fast Intentions Resonated HFCS paired with a NONresonated Xpipe
or
Fast Intentions Resonated TPs paired with an 18" resonator in the Xpipe

As per FI...resonators make no difference on HP/Power gains...The resonators only have an effect on the cabin noise/sound....the bigger the resonator the quieter it is...keep in mind that the 18" Resonated CBE is still louder than stock...FI offers a more deeper tone...Going with TP's will give u rasp/hissing noise and give the exhaust a higher pitched sound compared to running HFC's.

TP's will give u more HP but seen mostly on the top...ending up with u losing torque in the low to midrange area...I personally think that HFC's are the best way to go....I mean how often are u gonna be running ur Z on the top end? And honestly would u be running it at high rpms for long durations?

[1cleanZ]

Originally Posted by BOLIO 671

As per FI...resonators make no difference on HP/Power gains...The resonators only have an effect on the cabin noise/sound....the bigger the resonator the quieter it is...keep in mind that the 18" Resonated CBE is still lounder than stock...FI offers a more deeer tone...Going with TP's will give u rasp/hissing noise and give the exhaust a higher pitched sound compared to running HFC's.

TP's will give u more HP but seen mostly on the top...ending up with u losing torque in the low to midrange area...I personally think that HFC's are the best way to go....I mean how often are u gonna be running ur Z on the top end? And honestly would u be running it at high rpms for long durations?

Yes, I 100% already know about the products themselves from Fast Intentions, I'm not asking about resonators. I ran RHFCs paired with an 18" resonators in the xpipe on my G37 for over 2 years. I'm very familiar with the products themselves.

I'm strictly asking TP's vs HFCs, benefits vs cons.

And no, test pipes will actually give you a lower, deeper tone, not higher. Yes they may create a bit of rasp, but that's the intent of having resonators in both the TP as well as the Xpipe IF going w/ that setup.

Thanks though. The TQ factor I'm definitely taking into consideration right now. I felt immediate gains on my G37 when installing the RHFCs, even after already having the catback previously over a year.

[BOLIO 671]

Originally Posted by 1cleanZ

I'm strictly asking TP's vs HFCs, benefits vs cons.

And no, test pipes will actually give you a lower, deeper tone, not higher. Yes they may create a bit of rasp, but that's the intent of having resonators in both the TP as well as the Xpipe IF going w/ that setup.

Nope not with the Z34's....maybe so with the G37, but from my personal experience with the VQ, TP's gave a higher pitched sound with rasp...closely similar to running LTH's....HFC's gave a deep tone for me....

But hey....sound is all subjective, especially in the exhaust department with these cars....what might sound high pitched to me might sound deep toned to u...hope u figure out what will sound and work best for you...I mean everyone could give you their take on whether to go HFC's/TP's but in the end its your car that you will be driving...

[1cleanZ]

Originally Posted by BOLIO 671

Nope not with the Z34's....maybe so with the G37, but from my personal experience with the VQ, TP's gave a higher pitched sound with rasp...closely similar to running LTH's....HFC's gave a deep tone for me....

But hey....sound is all subjective, especially in the exhaust department with these cars....what might sound high pitched to me might sound deep toned to u...hope u figure out what will sound and work best for you...I mean everyone could give you their take on whether to go HFC's/TP's but in the end its your car that you will be driving...

Hmmm, now I am curious if there was a difference between the G and Z, just with it being a shorter exhaust.

Right now, I'm leaning towards to setup I initially ordered, RHFCs paired with a NONresonated Xpipe. Will be louder then my G37 setup with no 18" resonator in the X, and the Z exhaust is quite a bit shorter making it even louder as well.

[1cleanZ]

Originally Posted by BOLIO 671

Nope not with the Z34's....maybe so with the G37, but from my personal experience with the VQ, TP's gave a higher pitched sound with rasp...closely similar to running LTH's....HFC's gave a deep tone for me....

can anyone else vouch for this??? I would have thought it woulda been the opposite??

[Tazicon]

You probably won't notice a differance either way you go...........Why is this such a hard decision? I would be looking at cost effectiveness not a gain of 2hp.......or 3foot pounds of torque. Plus if I had a choice I would take torque over horse power any day. That makes it an easy decision.

[1cleanZ]

Originally Posted by Tazicon

You probably won't notice a differance either way you go...........Why is this such a hard decision? I would be looking at cost effectiveness not a gain of 2hp.......or 3foot pounds of torque. Plus if I had a choice I would take torque over horse power any day. That makes it an easy decision.

These are things I don't understand sometimes. We purchase 30-40k cars, and then try and save $1-200 on a $2k setup and sacrafice hp/tq?


Not looking at the cost, looking 100% at:

#1 Gains (HP/TQ)
#2 Sound